Vaulks and Bacuna

Pack and Ralls are our best options, sadly neither are very good at moving the ball forward but they are 100x better than a Bacuna/Vaulks midfield. Can anyone tell me what Vaulks role and strengths actually are? I can't think of a single positive thing he's done since the restart. As for Bacuna, he's stuck at right back for the time being and can't be relied on as a regular starting midfielder when he's seen as our back up right back.