Blog Post
I tend to not like temporary stuff as well, but just wanted to throw out there that you can definitely get all the rewards with the clones you have. It takes some patience and a few retries but I had 3 stars on tiers with just Appo and CX2 at R9. The rest of the R9s for the team paid for themselves with the repeats of the assault battle.
This one seems even more generous to me - instead of having to whale on two brand new units, we have one, and we get to use a conquest character that most people will acquire for free. Conquest characters are the most F2P accessible units out there. So far until the tiers that require Master Windu (which you'll also be getting, I assume) it's half the investment required for the same rewards. Seems like a win to me.
Hard locking behind JMWindu means that, if anything like Knightfall's cadence, the first 4 runs of this event (out of about 12 runs total) will be hard-capped at T4. A full third of the runs of the event you won't even have the chance to complete it. That does significantly alter the spending math.
I don't disagree you can earn some rewards back for spending on these new units. But again - why not roll out the event after Temple Guard, Depa, and JMWindu are out? That way, the first pass of the event, the true whales can attempt all tiers, and there's no feelings of missing out for even the biggest of spenders.