Are you suggesting that if an investigation was opened before the aid was released, then Trump is in the clear? Not trying to be difficult here. Just don't follow you.
But you should know that every outlet that has looked into the Biden connection has found it to be totally bogus. The conspiracy you are going to have to construct to save your guy here is going to be huge.
This isn't "pure politics." It's about a manifestly unfit man in the Oval Office abusing power, and the efforts to get him the hell out of there.