Can u use like Adam warlock or dr doom or something or even Loki...
We hav never seem Thor intelligently tap into the power of the power gem... Subconsciously but not overtly...
In this scenario i'll go with thanos I Thor is "just" given the gem... The prior time Thor held the gem was when he was wm and didn't know what he was doing. Though he posed a threat tithe universe... This thanos may be strong enough to resist...
I call it 50:50