Kevin, when TCS went to the present open 21.5 B/L motor rules, it was thought, by the organizers, that the 21.5 and the Silvercans were fairly close. Testing was done and the 25.5 was close, but the 21.5 was chosen cause it was, during testing, use slightly faster. They were totally unprepared for the chaos that ensued. Lap times dropped by nearly 2 sec. and an all out search for the "fastest" motor ensued. Not good and very expensive.
I'm sure that the gentlemen you quoted were sincere, but unfortunately were not aware of the true facts. This can result in some misleading posts, not entirely their fault, but based on incomplete or erroneous information.
There are any number of motors that will fill your present needs. Unfortunately, you as the organizer will have to test and make the selection. Just make sure that the motors are readily available, inexpensive, and will be around for awhile.