'For being gods, they are quite... foolish.' Arnold thought on his way to Muspelheim, 'Little did they know I could make out what they were thinking just by looking at their faces. Planning to backstab me? Hate me? Wanting to use me? Let's see who will use who when I am done doing what I have to.'
There was one thing Arnold hated the most. An Alliance that is formed by mutual need and not by the trust between each other. Such an alliance is always doomed to fail. But before taking any rash decisions, Arnold wanted to give the Asgardians a chance to make him trust them.
Even though most of them trusted his judgement, there were quite a few of them who didn't. Sadly, this was enough of a reason for Arnold to deem all of them as gods who will potentially betray him. That was the reason why Arnold decided to change the plan drastically.