What do I suggest we do with them? Well... If we can obtain Micah Parsons with our first selection, I would put the next 4 picks to offense. All four of them. If I'm going to spend a second pick from the first two days on defense, I'm going to look Edge rusher.
Strowbridge and Benito are both decent developmental players. Players we understand by now... Players who have seemingly bought into our system. In order to 'improve' on them, we'd likely have to expend a high pick... something I think we can ill afford to do at this point. Tua needs weapons, a better Tackle... and conceivably a Center. Our defense has shown that it is already very, very good. Like last year when we concentrated on the trenches (after Tua), this year should see us focus on a different part of the team... our constipated offense.
Sustainability? Well... Godchaux is likely outgoing... and the two players mentioned above are the incoming(as well as Davis and Wilkins). McCain and Rowe are both signed through 2022 and Needham and Jones are already their direct replacements... so that looks pretty sustainable... like REALLY sustainable.
The offense, on the other hand... is a mess. No starting RB, no slot WR, no quality depth, no Right Tackle... maybe no Center... we not only do not have a future here, we don't even have a 'now'.
So yes... other than a Mike LB, I wouldn't draft any defensive players til the third day. At that point... if we see a Solomon Kindley type who has slid down the board, then sure.