Let me try my best to understand your thinking here. The Usmanov proposal was put forward on the 15th June 2009. The season was over with man u winning their third EPL in a row. They did that with the help one of the most coveted players in the world, Rooney, oh yeah, and reigning PFA/UEFA/FIFA world best player in the world, Ronaldo. They had just been beaten in their 2nd CL final in a row.
On the other hand, we the mighty Arsenal had just (mainly thanks to signing Arshavin) managed 4th in the league (18pts behind the champions, 11pts behind 3rd place), our 4th trophyless season in a row, with the acclaimed world beaters you've just mentioned. To make matters worse we were going to face a 100 million shortfall on our property project. Oh and BTW 3 days before Usmanov's proposal we had just woken up to the sobering news that the main threat to us winning the league had got an 80 million instant cash injection by selling Ronaldo; no one knew how they would spend their money. But even with this backdrop I'm sure your reasoning makes sense.
At least here you make an attempt to realise who the man was really worried about when he gave that advice.