Yes, obviously that is possible and now even likely. Given what was known at the time, it was reasonable to target amyloid. There are reams of papers studying beta amyloid and all the myriad downstream effects on neurophysiology, but it could turn out to just be an intermediary step.

It's the maddening thing about biology. It's a brutal intellectual undertaking. You could have spent your life studying amyloid. Imagine sitting in your office with your stacks of papers now, considering what you have done with your life.