Is Destoroyah as a pterosaur plausible?

So, for context, I reimagined Destoroyah as a Dimorphodontid pterosaur that is entirely bipedal and is a apex predator in Europe. But, there's some aspects about my Destoroyah that idk are plausible and I need some help if I should revise them or scrap them entirely.

My Destoroyah is the largest basal pterosaur EVER, with males being comparable to short faced bears (Arctotherium augustidens specifically). What makes them bizarre is that they have adapted towards an entirely bipedal stance, which is how they got to reach such jaw dropping sizes. Despite, basically being able to look at an elephant in the eye, they are still capable fliers. Their hind "wings" have been partially reduced and their legs still retain a plantigrade stance. Now, Destoroyahs won't actively pursue their prey by foot and mostly rely on flight, but they can only pursue for just a short amount of time.

Now, here's the part where I'm having a hard time deciding on. Male Destoroyahs possess cranial bone orientations (at least that's what I think they are) that stretch outwards, similar to those seen in Burnetiid therapsids (Burnetia, Paraburnetia, etc.). Now, I'm sure that such headgear would probably weigh them down, so feel free to comment any other suggestions.

And if that wasn't enough, Destoroyahs also possess oppasable thumbs and some high amounts of intelligence, often compared to crows, Old World monkeys, and even apes. Scientists are still unsure as to why a giant apex predator like Destoroyah would need these aspects, but the current theory is that they serve as tools to help aid them in their environment.

And that's mostly it (aside from them being listed as Critically Endangered in the ICUN Red List). I don't really care if I get many votes, I just want some help and all.

Alright, buh bye 👋