As for Steimsma (why does everyone call him steamer, btw?), I don't think he was hurt, so you're probably confusing him with Krstic, who, I always thought, didn't play a lot because of his severe defensive deficiencies.
Pretty sure Steimsma had plantar fasciitis that postseason.
Injuries made a waste of what was almost certainly KGs last real playoff performance. Pierce's sprained knee, Ray's spurs and Bradley constantly dislocating his shoulders.
Edit: in terms of OP, Stephenson's a great player, but Bradley had a season in 2012. We can't know if Stephenson would have stayed healthy for the playoffs, but he definitely wouldn't have spread the floor like Bradley did that year.
Yeah, that sounds right about Steimsma and his foot problems that year. I don't honestly don't think that Lance would have been injured, given that he's never missed any time because of physical ailments over his career to date, nor is he inherently injury prone. Bradley is the better three point shooter, but it's not like Stephenson can't shoot - he's an excellent midrange shooter with definite three point range, and he's improved his percentage every year. In fact, his playoff ts% is better thab Bradley's. Now, people will say, "yeah, but Bradley moves so much better without the ball," but that simply isn't true. Avery might have made more baseline cuts that year, but Stephenson does as well - I've seen him do it many times off of passes from West or on out-of-bounds plays, and I'm sure that he only would have gotten better at that while playing here, imo. He can also post up, create his own shot (which you need to be able to do when the shot clock is winding down against a team like Miami), pass, and his size and strength allows him to play and guard positions 1-3. Talk about versatility. Seeing him play against the Heat in the last two postseasons only validated what I believed about him, and I almost forgot about his rebounding. That would have been huge on both ends for a team that always sucked in that regard, lol. A backcourt of Rondo and Stephenson would have been the best rebounding guard combination in the game, easily.