I guess I'm the only one who finds the worst aspect of Bertuzzi to be his play in the defensive zone. For all the grief Tavares takes here, with Nylander (especially since he's signed that contract) and Bertuzzi as his wingers, the poor fella at least tries to be relevant in our end. Nylander started the season with a much improved defensive effort, which has faded, but how Bertuzzi escapes criticism in our end escapes me. And yes, I'd like to see more from JT in all 3 zones, but let's be honest, if his shooting % was simply at his career average, his goal total would jump from 14 to 23, and over the last 10 games working with his line mates, he's got Nylander scoring 2 goals off of 39 shots, and Bert netting 1 off of 17 shots, just over 5% and just under 6% respectively. With captain John adding his 5% average over the same time frame (2 goals from 40 shots) we shouldn't be surprised that line is getting caved.
Keefe has to be assessed some of the blame for this. The line is not working. I'd argue it's because all three players are poorly fit for each other. When Nylander was going all world it hid the deficiencies of the 3 players, and the line looked ok. Now, you have the most skilled player on RW, working with a deligent/detail focused but declining C, and a hard working but not high IQ LWer who can't keep up with one and doesn't think the game like the other. They are all suffering, with Bert being, for me, the biggest liability.
If you can trade Bertuzzi for a 2nd, and you can turn that into Tanev, leap at the chance. If you don't want to take a risk on Tanev keep the 2nd. But if you think you can trade Bert to St Louis for Parayko, I'm guessing the Blues would laugh in your face. They're a goal scoring starved team, and CP currently has more goals than TB with Colton playing 23:50 minutes a night.
The only other option, imho, is to throw Bert back up with AM and let his mucking help free up the puck for Matthews to deposit. Again, Sheldon.
Otherwise, accept the experiment didn't work and trade the player.