I don't think Simmons or Ingram is some kind of franchise savior. Simmons is a great fit as a 4 in the modern NBA though because he can guard inside and on the perimeter, rebound, handle the ball like a guard, and score inside. Even if he never develops a reliable jumper, he is still going to be a very valuable player. I see him as a better version of Draymond Green who can create offense on his own much better than Green.
Summary: Davis' intangibles aren't as bad as Andre Smith's, but they're bad. Davis is a highly overrated prospect, but some team will still draft him in the top 25 picks. In the beginning of the year, his tape was terrible and this turned me off, but once he got in shape toward the middle/end of the season, he was far more productive. Davis will be as good as he wants to be, but ultimately he's not the type I'd take a chance on. Players with really poor intangibles - especially offensive tackles - don't often pan out in the NFL. Two sources have told me he performed poorly during the interviews at the 2010 NFL Scouting Combine.
Player Comparison: Jason Peters. Peters is an elite player when he puts in the work, but despite a great skill set, he is a pretty average tackle. Like Davis, conditioning and love of the game is an issue with Peters.