Spinning is trying to tell me that Seattle would legitimately be interested in a 1st round QB when they just signed Flynn in Free Agency.
If any of those teams you listed had the #1 or #2 pick, they likely would've jumped at Luck or RG3. Outside of that, they weren't gonna take a guy in the 1st round that isn't assured of being better than a guy they have on the roster that they invested a lot in (picks or money or both) at one time or another.
The only teams that take non sure-fire QB's like Tannehill, Weeden, Gabbert, Locker, Ponder (I'd personally rather have Weeden over any of these guys, but that's neither here nor there), etc. in the 1st round are teams that have given up on their current starter. Clearly, those teams have not, whether or not YOU think they should. They'll address a position that they deem a greater need.
Morris Claiborne is probably going to be a good NFL CB. Morris Claiborne will probably be a better NFL CB than Sheldon Brown. Tom Heckert probably felt that Morris Claiborne would be a better NFL CB than Sheldon Brown. Mike Holmgren probably felt that Morris Claiborne would be a better NFL CB than Sheldon Brown. But they did not pick Morris Claiborne.
Why is this? Is it because they think Morris Claiborne is poopy? No! It's because they felt that while he might be an upgrade he probably wasn't a once-every-5-years type prospect and they had a position of greater need and they could make do with Sheldon Brown for one more year, that upgrading that position was something they could put off for one more year and hopefully get by.
A feeling which would certainly be amplified if Sheldon Brown were a couple years younger and they had invested a huge contract in him in the recent past.
No one in the universe thought ANY of those teams were going to take a 1st round QB. If they took a QB at all, it would be the developmental type they could get in later rounds, like the Seahawks did. The Chiefs didn't take one at all, so they must feel they're set. The Cards took one in the 6th to go with all their other developmental QB's and the QB they desperately hope can justify what they paid for him JUST LAST YEAR. The Bills didn't take a QB at all either, obviously they seem ready to go to war with the QB that they just gave a big extension to IN THE MIDDLE OF LAST SEASON.
Only 4 teams came into the draft looking to replace their starting QB ASAP, and they all took 1st round QB's. End.
Now if you want to argue that since no one else was looking to draft a QB that high so the Browns very well could've waited until the 1st pick of the 2nd round to get Weeden, that is a fair argument.