Although some don't like to use the word, rebuilding is exactly what this team has been doing the last few years. It has been very impressive what they have done in the last two years alone. Not only that, but they have done it by using primarily the draft. And being overly cautious in FA will be paying dividends come next year with nice cap relief. Can they develop a complete team without signing and big name guys in FA going forward? I have my doubts.
I think you have to supplement because it just takes too much time to build strictly through the draft. Garrett started his process by revamping the offense, particularly the line, but we couldn't win because we weren't doing much on the defensive line other than adding players like Selvie and Mayowa.
Now, we've been supplementing that offense some (to replace losses) while trying to build that defense, but it's possible it's left us without much of a receiving corps with Dez's demise and Witten slowing down and then retiring.
We still aren't completely done on defense with possible needs at 1-tech and at least one safety spot, so the question is whether the still-building defense and running game/offensive line are at a high enough level to compensate for a questionable receiving corps ... or if players at WR and TE can outplay their value.
I think what we've got can be good enough to get us back into the playoffs, but isn't complete enough to put us in the Super Bowl. I hope some unexpected players step up to prove to be the difference between being playoff-caliber and Super Bowl-caliber (and make up for not going after top FAs at those positions) but I don't expect it.
