I wouldn't believe SPORT if I were you. They have a knack for reporting false news all the time. Most of the stuff they report all the time is false and I'm almost certain this is false too.
There was no real interest in Osimhen from Arsenal. If there was we would have known of it and other news channels would have reported it too the same way we all knew about the interest from Chelsea.
Having anger issues is bad, but I feel it's actually exaggerated a bit. Aside from Finidi, I have not heard of Osimhen having or causing any issues in the locker room or disrespecting his managers. If a club really wanted him, I don't think that would be an issue. People like Diego Costa, Arder Turan and Balloteli were still employed
You would have simply said that you are not aware of Arsenal's interest in Osimhen. A quick Google search would have help you to see that the news received headlines in some news outlets.
Regarding the striker's disagreement with coaches, he had one with former French Napoli coach Rudi Garcia. The Nigerian reacted angrily at the coach when he was substituted.
The reason for the post is not to criticise the player but to derive some lessons. Some of the players you mentioned would have achieved more if they were well-behaved. Every coach will not sign a disrespectful player if they have other options.