Sabrblade wrote:I like the twist idea of the arm's identity being the deceased Alpha Trion's, since it is a very fuchsia-colored arm.
Didn't the classic Trion have some blue/purple on that arm though?
As for why Optimus or Smokescreen wouldn't/didn't notice the familiarity of the arm when they saw it, for Optimus, maybe he did. He probably just didn't get the chance to say so out loud/give exposition to the audience.
Or he may have recognized that the arm was from a Prime, just not one he knew all that well. One way or another, it's pretty clear he recognizes what Megatron did, otherwise wouldn't have been as horrified and pissed off as he was.