Maybe one on loan and one permanent but losing ake would be awful. Not sure who we would want anyway from the gunners they have some good young players but we need more proven atm. Not sure ake would leave in this window but I have a feeling Arteta has a very convincing plan for the Arsenal and their future and could convince him
Chelsea allegedly have a buyout clause reported at being £40 million. They can offer that and we have to accept it. That doesn't stop someone else buying him at a different fee. That also doesn't stop us being forced to accept the Chelsea bid at £40 million as well as a bid from another club at a different fee and Ake choosing to go to the other club.
Nobody can force Ake to sign for Chelsea. All a buyback clause means is that we have to accept the bid from Chelsea at that fixed price, not that Ake has to sign for them. They could be the only club to bid for him and he could still turn it down.
Alternatively they could bid at £40 million and Arsenal also bid at a level we find acceptable, say at £50 million, and it's then up to him to decide which move he preferred.
Or Chelsea could choose just to not get involved at all and he just goes to the other club. All the buyout does is give Chelsea an option to make an offer that has to be accepted at a fixed price. Everything else about the transfer beyond that is normal.
There are then some complications on what that acceptable price other clubs would have to pay in order to stop them trying to pull a fast one in cooperation with Chelsea. So he is probably available at under true market price at the moment. The Telegraph suggested £45 million to other clubs but I'd hope we could push that a little further.
Edit: I'm sure there was a post I was replying to when I typed that! Maybe a 2020 hallucination...