True, though the spell open combo would probably lead into a weaker WS rather then a strong one since it would let you open a combo instantly with 0 TP. Especially since most RDM spells would be fairly low MP cost enfeebles, but still an interesting possibility.

Also I was going on the assumption that the spell combo bonus would simply allow you to instant cast the spell (seemed appropriate for RDM), but I have also been considering other combo effects.