That's why you want to build through the draft. Honestly, why does everybody think this is such a bad philosophy? It is very very very rare for a team to buy a Superbowl trophy through FA's.
it is a great idea..if you have picks. currently we have 5 so nots so great and idea. but no team builds entirely thru the draft.. it is a good mixture of both. look at the patriots! got randy moss and obliterated people, picked up wes welker and he helped tremendously. they werent drafted by that team but helped out. you need a good mixture of both. you cant just draft people, it takes to long to develop them and by that time they do they may want new monster contracts or the head coach may be under fire and you cant get all fa's because they would be considerably more expensive and put you in cap hell later on.