There's another implied issue that no one is mentioning. When you play uptempo on offense, you're less likely to commit fouls and more likely to draw fouls. When you press on defense, you're more likely to commit fouls than you are to draw fouls. And your big men are especially vulnerable to commiting fouls around the basket.
Our starting bigs (JVB and Ejim) simply aren't good enough to be the last line of defense. JVB was never this type of player, and while Ejim is athletic enough to be this type of player, he isn't there yet. Plus, Ejim is our only legit front-court scoring presence right now. He can't get into foul trouble, as Railey, Godfrey, JVB or anyone else can't really post up or push people around enough to get the inside points or offensive rebound/put-ups we need.
Bottom line is we can't get Ejim into foul trouble, or we're toast. We become one-dimensional without his scoring capability. And if we press, Ejim is likely toto be in 3 foul range in the first 10 minutes. Even if we only press three or four times per period, the risk is too great. Why force Ejim into a fouling situation?