While this is true of nearly all NFL teams, Jerry is the exception because he and Stephen weaponize the cap to keep from spending money on high quality free agents, so we absolutely should worry some about the cap. The defense needs some money spent on talent too.
We've seen this a lot the past 30 years. If they do sign Pickens to a ridiculous contract, it'll be good we have Pickens but bad because they'll use that to justify not bringing it defensive talent aside from rolling the dice in the draft.