He's not as creative as Eriksen with his passing but Rabiot is good player and his ability to carry the ball progressively in midfield would've given us a different element. That ability is still equivalent to progressing the ball from midfield or from the back to forwards. I haven't watch a lot of Gravenberch's games but based on what I watched up to now, Gravenberch doesn't strike me to be Eriksen kind of midfielder or FDJ kind of midfielder, but instead he has something similar to Rabiot in term of their passing level and ability to carry the ball progressively. This shows Rabiot can fit into ETH's profile.
We can't settle for Rabiot and Eriksen for long term. But for one season, I can live with it. In contrast, we ain't survive with DDG and Martial next season. And we need a progressive and proactive right back that can support Antony and Amad because our right back is nowhere near to what Shaw offers on the left. To do these, I believe we have to stick with Rabiot and Eriksen. Put it this way, signing Rabiot is also already considered as upgrading our midfield because he's far better than McFred in experienced, defensively and progressive play.