i understand his assumption but its not correct..
1. sierras may not have been on the web shop but were available to buy the same time as baby jets. the professional customers would've ordered the sierras and not the baby jets.
2. people who ordered multiple baby jets were (i believe) in some cases allowed to switch their orders into sierras... and retain their place in the line.
bear in mind.. sierras are just a denser form of baby jet. containing the same identical hardware, just packaged differently. actually, containing less hardware as sierras do not contain a controller and require use of an external pc controller.