I want to chime in here since I'm with you, Edouble, about Mason, being one of his biggest proponents over the summer... but I also think Jason needs some defending here.
We're now under two weeks from our first exhibition and about a month from real game action. So here's the question: if Jon was planning for Mason to be playing big minutes alongside our key rotation players, why wouldn't he be practicing like it? I'm with Jason that I see no benefit to hiding something as innocuous as our 7th/8th man's role during an open practice.
If, for instance, the plan was for Mason to get 10 mpg at the 4 alongside a lineup that looks something like 2 out of our 3 guards (including Sion), Cooper/Kon, and Maliq/Khaman, wouldn't that be a lineup that would merit getting significant run during practice? I think most of us assumed that this would be a lineup we saw a lot this year, but the fact that it wasn't is extremely noteworthy/newsworthy... and it's the exact type of insight we're lucky to get from a guy like Jason for free
It's also worth remembering that rotations change over the course of the year. Just because this is what things look like now doesn't mean it won't be different in January. In fact, I think it's very possible that this is Jon's initial plan based purely off of talent and practice performance, but once this team gets punched in the mouth (proverbially speaking, of course) in game action he'll decide he needs the defense/toughness Mason brings.
Here's the final thing: Mason being a guy who has already shown his versatility and flexibility for four years at Purdue makes his situation a bit different. If someone with Mason's profile was a freshman or sophomore, I'd be more worried about his ability to shift into a bigger role when needed based on what Jason is reporting. But as a super senior who has been a swiss-army knife on a top-tier Purdue team, I think Mason is much better suited for a role that fluctuates based on the matchup, how freshmen like Kon stand up to ACC play, etc.