Isn't there an alternate version, that after an unexpectedly strong showing against Ostrow, Rybnik wanted him to prepare for the semi final without distraction.
Don't know which is true, but if it is the 28 day visa then how is a sport that is based on riders being available all season being propped up by riders who turn out to be temporary signings (although this is never mentioned when the signing is originally announced (cf Adam Ellis last year))