With or without a Dre'mont signing, I would feel the same way about addressing the DL: Sign multiple guys to increase depth across the DL instead of being top heavy with on one or two guys...
We saw the Browns take this approach with Garrett and Clowney this past two years
Defensive line is an area of compounding results.
When your defensive tackles don't demand double-teams, then the offensive line can slide protections towards Myles. He gets double or triple-teamed every single play and all of a sudden the best defensive end in football is neutralized.
By adding better players inside, you force the math to balance back out. Now all of a sudden those three interior linemen have responsibilities that they need to focus on, and Myles gets himself alone on the tackle, with at most a tight end or RB helping out. You've now put yourself in a winning position.
I also want to point out that Jadeveon Clowney is not, and has never been, an exceptional edge rusher. He's a great blend of size, strength and speed--but it's all straight-line. He can't bend around an edge and can't finish a play. That's why he's always been so good against the run but not great at generating sacks. It's why his best pass-rushing snaps over the past five years came standing up as a linebacker in Tennessee, rushing the A-gap.
I am firmly in the camp that says the way to open up Myles and our defense isn't a better edge on the opposite side--it's two really good defensive tackles occupying the middle. Prevent a guard from helping the tackle and you've won. Myles beats a single tackle. He beats a tackle who gets a chip block from a tight end or RB. And, if they're keeping the tight end and/or RB in to block, Myles just eliminated a passing option, helping the math in your secondary.