I don't think its required. BUT...I don't think you can go into training camp or the preseason, after stressing all offseason about how you need to improve in pass protection, and all you have to show for it is an elite Tackle that you've traded away, and replaced with a mid-round pick or very cheap veteran (like a Fluker). That's not reflective of what your offseason objectives were.
I don't see many paths to getting a competent replacement in FA. Maybe they could swing a trade for a middling veteran, but none come to mind at this point and you can't go into the offseason expecting that either. So your replacement is coming from the draft, regardless of where you take him. And unlike a lot of our draft picks, that pick is going to be expected to start day 1 and play well, regardless of whether he's a 1st, 3rd, 4th, etc. round pick.
That's why I'd be targeting a combination of picks. Like a late round and an additional, or if its an early 2, I want maybe two more picks with that or something similar. If nothing else, I'm taking a volume approach to it. I'd draft 2 or even 3 lineman and have a competition.