I think the "ka wa" here is "question ka + exclamation wa", symbolizing rhetorical question with implied negative answer ("who holds a grudge against spring? [no-one, that's who") -- like at the end of no.95　(and similar to "ya wa") -- rather than "question ka + proto-topic-marker-off wa." With that analysis we are safe from question words as topics.

Also, did you choose "variety" anticipating "variegated" for tomorrow's "chigusa"? If not, very fortuitous!

--Matt