Brown, Kyle and Schobel would be the ones I'd vote to go up based on longevity with us/performance.
Unlike Bruce whom I sure never benefitted getting sacks when our offense had us up 21 points early/late in games?
I hate to say it but if Lamar was in an offense that wasn't Roman's he'd not be as successful as he's been. Time will tell as talk is Roman is not going in to be Baltimore after this season and have a suspicion that Lamar will be under a 1 year franchise type deal. Similar to what the Redskins did to Cousins.
Yes a better WR can make a QB look better. Yet it can also be the reverse. As is the case of John Brown he played with Lamar as a rookie and Josh in his 2nd year. He was better with Josh in terms of catch percentage, yards per game etc.
It won't be Baltimore as they've been one of the best franchises at managing the cap/personnel issues. Not to mention Harbaugh is a smart enough coach that knows that you can change a system to suit the QB as he did when went from Flacco to Lamar. The question is do they franchise him a few years to keep him around or just franchise him this offseason and deal him asap.