That's not true bud.
@34 OLYGUY first off WELCOME to the forum. It makes NO difference in which order you do this. Go ahead and register EACH of them now and then get your P107 if that works out for you.
You can have Commercially Registered aircraft and no Part 107 (
think of a company that owns several but they HIRE the RPIC). Commercial Registration does not require/stipulate you have to have P107 in hand before registering for obvious reasons.
The only thing that matters is that BOTH routes are completed before flying for anything other than Hobby/Recreation.