Can is the holding mid for Liverpool when Henderson is not there. When he is, then Can switches to B2B.
The fact that Henderson is a better regista than Can tells you all there is to know about comparisons with Pjanic.
If we play with Can in the middle (unlikely) then we'll need playmakers on the sides.
Allegri has always shown to be of the opinion of having a regista and not just a DM in the center (same for 90% of Italian coaches). Everything points to Can as a mezzala for now. Its why Bentancur and Pjanic got pulled back to regista instead of mezzala as they were previously, because they are the better passers and have better vision. Same with Marchisio.