Try comparing arm strength, durability, youth. Fact is the kids is tough and has skills that Jay doesn't posses.
Also consider that like others have said the Draft is a crap shoot. Rivers looks great on paper, but what will he do in the pro's.....If the draft was a sure thing, then we'd have Yatil Green as 1000 yd WR, with KAJ/Collins/JJJ rushing for 1000's yards and a line of Brandon Winey, Todd Wade, Eugene CHung, Grey Rugemer blocking......Not to mention a solid 3rd DB in Jamar Fletcher....
I'll take someone with some game experience over the rookie any day. Fact is Jay/Brian are all but gone and there is no one to develop. Bringing in someone like Ramsey gives you the best of both worlds a young QB who as you pointed out is the same as Jay but has room to Grow....Jay is the finished product! He has no upside! What you have seen is it!
Dolphins 17-0: We must have posted at the same time...I'm not trying to steal your thunder..We just think the same...lol