Cesc Fabregas sealed a return to the Premier League last week, surprisingly with Chelsea.
The Spaniard has been very open about the fact he discussed returning to former club Arsenal, only to be spurned by Arsene Wenger.
He is quoted by The BBC: "We talked with Wenger but he said he'd find it hard to make a place for me on the pitch as Mesut Ozil had my position covered."
If Jose Mourinho had taken the same approach, Fabregas would not be a Chelsea player right now.
Chelsea already have a number 10, Brazilian playmaker Oscar, and other players who can play in the position, with Eden Hazard and Willian also capable of playing centrally.
Yet Mourinho, keen to strike a major blow over his rival, has clearly shown more flexibility when it comes to his squad, to accommodate Fabregas.
Wenger may have Mesut Ozil, but the German frequently failed to last 90 minutes last season, and went through spells below his best. Surely the idea should have been to give him support this summer?
Now there's an argument that Fabregas is 'too good' to be cover for Ozil and could force the record signing out of the side, and that's true - but not only is competition for places vital, the demands of a 50 plus game season should really have made both players a necessity.
Fabregas is also one of the most flexible midfield players in Europe, capable of playing deeper, as a number 10, or as a striker. Last season for Barcelona he played the majority of his games in an orthodox midfield role.
Arsenal have options here, Ramsey, Oxlade-Chamberlain and Wilshere, although again, surely Wenger should be adding to the mix rather than maintaining the status quo?
Mourinho's willingness to push the boat out for Fabregas has made Chelsea stronger, and made Arsenal's chances of winning the league next season tougher - and that is something Wenger could have avoided.
Arsene Wenger will have his own plans in the transfer market, but his inflexibility when it comes to his former star could turn out to be one of the worst decisions in his managerial career.