I read a news that Pochettino was asking for more rights or privileges I make input in the buying of players. So I deduced that some of the players were signed by Todd Boehly without consulting the coach. So I suspect that the coach is having difficulty blending these players because some of them are not the couch favorite. They were bought by the management without his input and might not fit into his plans. The coach should be allowed to choose his transfer targets.
If indeed something like this happens then I think this is not a new thing for Chelsea because last season was like that too, but it does need to be realised that one's character cannot be changed easily as well as Todd who always wants players according to his wishes not as a function to improve the club like last season 
But I'm not too sure about this issue because if you look at what Pochettino did last season there were several decisions such as overhauling some players by selling players who I think are still very good but not in accordance with Pochettino's wishes it becomes a form that Todd gives more confidence to Pochettino for the players who will be at Chelsea and who are discarded but does not rule out the possibility also for purchases still referring to the wishes of Todd as the club owner.
It's a good thing Todd Boehly has more confidence in Pouchettino and has allowed him to continue his managerial role and take his time to organise the team into performing better, however it seems Chelsea players are beginning to connect with the coach based on their performance in their last match against Fulham, cause several players that were underperforming did great and Chelsea even scored 2 goals with a clean sheet.