I agree with everything you say here. Going into our last home game, I doubt anybody thought our team or our players had regressed. Then we lost to a team everyone said pre-season was near-unbeatable, went 1-1 in the ACC tournament without Ryan, and got upset in the NCAAT, also without Ryan. It wasn't a fun four game stretch to end the season, but I just don't think you can fairly characterize it as a "regression."
Well, obviously I'm not inside other people's heads, but this has not been my impression. Especially since the losses didn't in any way seem to come as the team played progressively worse basketball. The Ohio State loss came immediately after we played great in Maui. The Temple loss came out of the blue. The FSU and Miami losses (along with the lackluster home win against St. John's) all came in our typical doldrums period of late January and early February -- and the board was pretty close to meltdown mode, despite the fact that the two losses in that period came on a last second shot and in OT. Add in some more losses before, in, or after that period, and DBR would have had to shut down a couple times more.
Then we won 7 games in a row until the final four game stretch. If we'd gone 5-2 or 4-3 in that time (hypothetically due to letting the end of our bench see more time), and finished third, or maybe even tied for fourth in the ACC, you think everyone would have been OK with that? Moreover, you think we would have been more prepared to win our first game (with a more seasoned Michael and Quinn) as a 5 seed than as a 2 seed?
Well, Mason scored in single digits in three of our first six games, so the fact that he also occasionally did so late in the season, to me, doesn't seem like a regression. Perhaps it was a sign of a lack of progression, but I don't think that's the same thing. Plus, he did progress in some areas, especially free throw shooting.
Seth has a problem when he's being guarded by a bigger player. He's had that problem all season. So, again IMO, this is not a function of regressing so much as it is an issue with our personnel. With Tyler and/or Quinn playing PG, we forced Seth to be guarded in general with a much bigger SG, at least after we got into the conference schedule.
I agree he was inconsistent, and in the last several games he seemed to have lost confidence. On the other hand, I watched him as much as I could against Lehigh and he was trying really hard to get open. And he did get open, many times, for a split second, which is about all you can ask for in high level Division I. If his teammates had been looking for Andre and had given him the ball at the right moment (and he had the confidence to shoot it) he would have taken and made a lot more shots. That's what happened in the games like Michigan State and the 2nd Florida State game; his teammates were watching for him to get open and hit him the moment he did, and he delivered. A couple times against Lehigh, his teammates noticed him a second too late. Sometimes they even gave him the ball, but by that time the defender had closed on him. The fact that he doesn't have as much blow-by ability as we would like isn't really regression, though, is it?
He still averaged 0.75 blocks per game in that last eight game stretch. And he went 4 of his first 8 games of the season without a block, averaging 0.86 blocks per game in that stretch. So, again, I don't see this as regression. Also, our team defense was much stronger in Ryan's last eight games (2nd UNC game aside) than it had been before, so maybe whatever Ryan was doing to help the D necessitated fewer block opportunities?
Quinn's big early season performances came against Western Michigan and Penn (although he also did have decent games against Ohio State and Georgia Tech). He had always been taking shots that were not the best shots, but he made more of them early against lesser competition. He's a freshman who makes freshman mistakes (like the three against Lehigh). That's generally not something you grow out of by playing a few more minutes a game.
This happens a lot at Duke. Ryan Kelly hardly played once the ACC season began in his freshman year. Same with Miles Plumlee and Josh Hairston, and lots of Duke players over the years. What someone did at Mississippi State and Alabama isn't really very comparable. This is what Coach K does.
I'm not trying to just be contrary here. But as I said in the beginning of this post, I don't think we regressed in the last third of the year. I think we got our butts handed to us in the last four games, three of which were played without one of our most important players. I apologize if I said or implied your expectations were unfair, but I do think perhaps your perceptions of the whole season are colored by how it ended.