We can not blame others who think Sean Strickland got that belt because of luck as many here are fans of Israel Adesanya and because Alex Pereira defeated Strickland in the past and Adesanya made a comeback for his belt and won a great battle against Alex Pereira you can not blame them if they think that Adesanya can beat Strickland easily, as that Trash talking has got into him for sure Sean Strickland will still need to prove his worth, for sure that defense of Strickland really is effective against Adesanya for sure he is still enhancing that defense of him,
I don't understand how can anyone claim that Strickland won the belt due to luck. You could say that if he had won by a lucky punch etc, but they fought a full distance and he dominated Adesanya in 4 out of 5 rounds (iirc).
In his last 11 fights he lost only to Pereira who, since then, proved he's a real deal by winning the middleweight belt and then the lightweight belt.
There's no real shame in losing to a champion of a higher weight class. Plus, Sean probably improved a lot since that fight, also by having Alex as his sparring partner.