First of all, we can't say "all year" when it comes to JQ. There had to be ZERO expectation (other than from the annual 40-0 crowd) that JQ would play before Christmas. So for him, you can just say starting with SEC play.
We obviously would have been some better. JQ would have provided better defense, good shot blocking, good rebounding, been more consistent than the FR Moreno or than Garrison. JQ would especially have helped vs certain teams like Florida. But offensively, I'm not sure he would have helped much (beyond what we got from Moreno & Garrison).
Lowe would have helped, he was probably the 2nd closest thing we had (after Oweh) to someone who could go get a bucket when need one. His outside shooting wasn't good though, but he was quick enough to get past defenders even when they were giving him the jumper. But he would have allowed Aberdeen to play a role more like last year (but more minutes than last year) and relegated Johnson to the end of the bench.
Williams was starting to show some positive signs when he got hurt. But far from a start player, but a contributor. He would have helped on nights when Chandler was missing shots, and in certain defensive matchups.
Don't forget the 5 games MoD missed, but really just 2 important games (Gonzaga & UNC). UNC game was close enough, he would have probably been enough to push us to a win in that one.
Lastly, many forget that Oweh didn't practice/work-out much of the fall with a foot injury, and I think that is why he started so slow (13.7ppg first 9 games, 20.3ppg rest of season).
While better, with more options, and needing less contributions from the bottom 2-4 guys, a 100% healthy team still would not have had that 2nd or 3rd "go-to-guy" who can get you a basket when you need one. So I think a healthy team would have probably had 4-6 more wins, and walked into the SEC-T in 2nd-3rd place, with a 24-7 record & ranked around 10-12, and probably got a 3-seed in the NCAA-T.