I think if TakaraTomy does Defensor, they will rename and recolour Rook into Groove... or hold off until there is a motorcycle Deluxe mould for them to use in place of Rook (if the Technobot rumour is true, that would be an option).
Even though we have Groove as a Legends toy from Hasbro, the TakaraTomy combiner sets don't include the Legends member of each team (Powerglide, Blackjack), so their Defensor set won't have Legends Groove to remain at the same size/price-point as Menasor and Suprion.