3 things everyone might be missing:
First, Bush is considered one of the best RB prospects to come out in the last 20 years. He's been compared to Marshall Faulk. You can't pass up on that kind of talent if you have an opportunity to draft him. DD does not change the game and force teams to game plan against him, as Bush might. That makes Carr better.
Also, if the Texans take Bush, they could trade DD for another pick, or help at several positions. Think Deuce/Ricky, or McGahee/Henry.
Finally, saying you are looking at Bush at #1 increases his value in a trade. Houston could make a killing trading that pick.
The statement on Bush being top RB in the past 20 years is a silly statement - show me where that was found. Reggie Bush is very good, but his team is one of the most dominant in years at the college level and he is relatively small compared to most NFL backs.
Silly? "Overview:
Reggie Bush is a phenomenal player with special attributes rarely seen. Analysts have compared Bush as the one of the best all around football players to come out of college since Marshall Faulk and Barry Sanders. Although only a junior, Bush has the experience, ability, and knowledge to be a starter at the next level and make a firm impact in no time."
"With his special playmaking ability, Bush will go high in the draft whenever he declares. With him being on course to graduate after three seasons, he will likely turn to the NFL draft this year. He could very well be the first back off the board, but is definitely a first round pick wherever he ends up. He has that special all around ability to be a major force as a runner and receiver much like Marshall Faulk during his prime with the Rams, and he's going to be a big time playmaker at the next level. "
"Bush reminds his head coach, Pete Carroll, of Gale Sayers. In today’s NFL, Bush’s duality as both a rusher and a receiver will also cause many to compare him to Marshall Faulk. "
"...certainly the most dynamic prospect at HB to come along in a while."
Should I go on? Look 'em up.