I was just looking into this issue and noticed your post.
I am wanting to see if we can report on sequences so I can see at which point in the sequence did a receipient reply / respond - so for example, a sequence might have 5 emails. Would it be possible in Hubspot (or using a plugin) to report on the fact that (e.g.) out of all the replies, 20% came from email no.1, 50% from email no.2 etc..?
Best
Robert