An interesting thing to consider is, while there are certainly plenty of All-Star worthy teams, are there many All-Star worthy individuals? Like, I assume if it was all strangers, we would only get one person per team and then follow TAR29's schoolyard pick. Most of the memorable Racers are because of their team and maybe not on their own. Not everyone is a Rachel Reilly or a Blair. But at the same time, part of their being memorable Racers are because of the fun and drama with their partners. I guess bland individuals would be mitigated by any possible clashes between those who get paired up. Though unlike TAR29, most of these All-Stars would probably know each other already or at least know of their Racing style.
I assume they're hoping for a cast full of Mark & Mallory-s. Or the odd chance that a team of rivals gets paired up together without any choice. Unless they do a random draw type of thing which could provide the drama they would be looking for.