Plarail TOMY Thomas NEW RELEASES

Hey, so if Hurricane and Frankie are TS-22, and there's already a TS-20, what loco occupies the 21 spot

Shooting Star Gordon is TS-21. Speaking of these series numbers, TS-20, Luke, seems to be discontinued completely by now and replaced by Streamlined Thomas, but I can't find the Streamlined Thomas, nor Gordon, on Amazon, nor Luke anywhere! Usually the discontinued engines would still be sold until the stock runs out, and then immediately replaced by the new one carrying the number.

Also still would love to know some more about the set that supposedly includes Owen and Cranky!