Joe Esposito, is that you?
The problem with your theory is that Coleman's increase in minutes wasn't linear; it went from single digits until Purdue and spiked to the mid-20s after that. Maybe a light bulb did go off for Coleman in practice in between Iowa and Purdue, but there is also the possibility that Tubby realized the season was on the brink and he needed to swap out no offense, fewer mistakes for much more offense and the potential for more mistakes.
I mentioned Mav because that is who Coleman ultimately replaced in the starting lineup.
Certainly a possibility. However, one of my points is that the problem with your theory is that you have no way of proving our case any more than someone taking the opposite side can, and thus it is a fruitless argument that wastes everyone's time. If you are for Tubby, it is a great adjustment mid-way through the season. If you are against him, it was poor coaching that caused him to wait this long. The reality is a case can be made either way, because few, if any of us on this board, have the real inside scoop. So again, my main point is that speculation on this is fruitless and cannot be proved by anyone on either side of this argument, and because of this we should enjoy the fact that Tubby made a great decision to insert Joe into the starting lineup a few games ago. That decision may ultimately save our season.
Further, your point about Joe ultimately replacing Mav is also skewed through the particular shade of glasses you are wearing, IMO. He did not ultimately replace Mav, as you put it. The starters through Trevor's injury were Ralph, Trev, Rodney, and Hollins x2. Then the roster shuffling occurred with the move to a three guard offense. Julian was the first to be promoted to the starting rotation after the injury, not Mav. After some different roster combinations to find the right fit, which included experiments with Mav, Julian, Dre and Austin in some form, he has ultimately settled on Julian, Austin, and Joe as his starting backcourt, which obviously seems to be our best combination. Thus one can either say that Joe replaced Dre in the starting lineup at a guard spot due to his inconsistent play, combined with Julian's move to the point from the 2 guard spot, or that he replaced Julian at the 2 when he moved to the point, or that he replaced Austin at the 2 who was moved to the 3 when Rodney was moved to the 4. Or...you get my point. He did not replace Mav, because Mav was a replacement himself. A replacement who did not work out in the role he was inserted to, which ultimately resulted in our current lineup and Mav sliding into the 2 PG spot.
So please, take of your current glasses and replace them with some that provide a more balanced perspective. Otherwise, you simply pigeon-hole yourself into the position of a bitter fan who will spin anything to make it look like Tubby is a poor coach who needs to go. And quite frankly, I, and the a majority of the fans on this board right now do not want to listen to that schtick while our season appears to be turning around in a significant way. That's all I'm saying.
GO Gophs!!!