I think we would have lost to the Bucs, but I honestly believe we would have done better on offense if we had the same lineup as against the Chiefs, maybe even scoring 16-19 instead of 9. For whatever reason the Chiefs seriously laid an egg, probably due to the loss of both their tackles being too much to overcome. However, I don't see us having done better on defense, and possibly even worse, than KC did; so no, I do not think we would have won... more like 38-16 which is a bad beatdown. We need improvement on both lines and a better running game to compete, and either a new TE or to use our TE more effectively.
The KC team we played, in my opinion, wasn't the same team that played in the SB. They lost a key OT, and they also just simply played below their normal level - it wasn't all Tampa Bay. Sometimes teams play differently week to week.