I dont disagree with what you are saying but Arne Slot came from arguably weaker league (Dutch have weaker teams than Portugal does) and weaker club of
Feyenoord compared to Sporting, filling shoes of Klopp, with much higher expectations. And he didn't skip the beat despite getting next to zero transfer budget, albeit with decent squad. If he can do it, Ruben can, too
Erik had many challenges, no doubt, but he was also stubborn, and did many very strange things. At the end of the day, he can blame many people but he was the one that didn't succeed
He also needs to take responsibility for his own actions