Broke Time And Claims It Was Deliberate, Quintuple Agent, Those Fucking Chaos Dwarves Still Sail Submarines Up The Reik To Drop Off Hobgoblin Assassins On Our Doorstep, Way Too Into Sigmar, Literally Stole Ghal Maraz, Left Naggaroth Worse Than He Found It, and their leader, When He Faked His Death A Rumour Spread That His Tower Was Filled With Dark Magic Books And Literally Every Enemy We've Got Apparently Finds It Super Plausible.
"Way too into Sigmar" is brought up as Starke's flaw, and is considered to be as bad as constant hobgoblin assassins, breaking time, and having a less than secret library of forbidden books.
Yes, there's no such thing as a perfect grey wizard, which is the point of the above quote, but the fact remains that Starke's faith is brought up as the key factor in preventing him from being a perfect grey wizard. It is a notable, negative characteristic, and I am concerned that it will prove to be a problematic characteristic in the hypothetical future where he becomes patriarch.
I don't think it's fair to say his behaviour in-quest is going to be substantially different from how it is presented in canon. And yes, Boney could have written him differently. But why? There is nothing I can see about Starke's canon characterisation that necessitates a rewrite to fit into DL, and there is nothing in-quest that suggests such a rewrite has happened, unlike with characters such as Egrimm.