I have been reliably informed that Ross has been signed as Chelsea need to up their quota on English players to satisfy the UEFA rules, as was drinkwater from Leicester. Sat in in the stands or benchwarmer, suppose he will be happy on his £170,000 a week.
If you're looking for reasons why the deal is such a good one for Chelsea then look no further than their business plan which has been in operation for a decade now. The plan has little to do with getting players playing for Chelsea. It is to register them as Chelsea players, and then see a path by which they can be sold at a later date at an inflated cost to a buyer. This path may be by giving them a game or two in the first team squad (eg de Bruyne). Or it may be by farming them out on loan (eg Lukaku), see their value increase, and then selling them, without them getting even a sniff of a Chelsea place.
Barkley will fit neatly into the first path. He'll be given some game time so he remains in the PL spotlight to a degree. Then at the end of this season or next they'll sell him at a fee triple what they've just paid Everton, having in the meantime paid a fortune for a truly top class midfielder and so being able to say that Barkley is still a good player and well worth the £40m fee they'd want but is now well down the pecking order at Stamford Bridge. Cue another transfer for Barkley and another big wedge for his agent.