I've only caught a few Spurs games, 1 and a 1/2 to be exact, that's the equivalent of 20 games for the rest of you, and very little of Elson. My first impression was he is athletic and energetic on defense and crashing the boards. I'm starting to get the impression he's pretty dumb and his stupidity is keeping him off the court. Flabs on the other hand strikes me as a savy player with Euro-bigman skills but he doesn't have the athleticism or physical abilities to compete well.
I'll have to catch two more full games to be sure of my read on Elson and Flabs, that would be the equivalent of an entire season for the rest of you.