Genuinely, why did everyone think 86 Megatron was gonna be a retool of Megatronus Prime?

Back when this discussion came up, I was actually hoping Megatron *wasn’t* a retool, but everyone kept insisting that he was. Why? Why was everyone saying this? Was it simply because of the fact that Megatronus had similar parts to Megatron? Or was it because everyone was just saying Hasbro was “lazy” even though Megatron is one of their most recognizable characters?