It's entirely possible. The thing is this - we now know that there were people on the call, and people that heard about the call, and were uneasy with what they heard. (Wish I had a dime for every time one of my bosses said something that I was uneasy about) I'm beginning to wonder if Vindman deliberately talked to the Whistleblower and went to the legal counsel to cover his butt. But it always comes back to the question if it is an impeachable offense.
I don't watch soaps, but this whole "impeachment inquiry" is being conducted as a Kangeroo court. And Dems are going to drag this out as long as they possibly can hoping someone notices and doen't vote Trump for re-election.
Sorry for the Triple Post - I'm having some problems with my computer.