From the NY Times quoting the redacted transcript -

When Mr. Zelensky said Ukraine was almost ready to purchase American Javelin anti-tank missiles so it could better repel armored assaults by Russian-supported fighters, Mr. Trump pounced.

“I would like you to do us a favor though,” Mr. Trump responded, beginning a series of pointed requests. The president pressed Mr. Zelensky to use the help of Attorney General William P. Barr in opening an investigation of a company involved in the beginnings of the F.B.I. inquiry of Russia’s 2016 election interference. He also wanted a corruption investigation connected to former Vice President Joseph R. Biden Jr., a Democratic rival.

He never said anything about fighting corruption.

So in your world “I would like you to do us a favor though,” doesn't mean the missiles were contingent upon the other stuff? Since the release only came after he "got caught with his hand in the cookie jar", would the Ukranians still be waiting for those missiles?