Having to play with just 1 striker, our no 10 has to be a threat to score as well. Unfortunately Silva is not. KDB on the other hand is. This should be the main reason for KDB to play the no.10 spot. Pep also will play him at that position I think. If you read articles about what he's looking to sign:
1. 2 Full backs
2. 2 Center backs
3. 2 Center Midfielders
4. 1 Winger (L or R)
5. Backup Keeper
6. Backup Striker
There's no mention of a no.10 or an attacking midfielder because we have two of the best out there with KDB and Silva, with KDB being ahead of Silva in terms of starting as a no.10. Muller flourished under Pep in Bayern and I reckon Pep will make KDB flourish as well. KDB is a much better direct-passer than Muller while his finishing ability is on par with Muller. The only thing Muller has over KDB is his heading ability and his non-stop energy. Other than that, we've got ourselves a player here.