Obviously up to you but he doesn't get a solo rate up again for quite a while, specifically october/november of next year so do you want to wait that long. Only other time he goes on rate up outside class based summons between then and now is Chaldea boys collection in march next year as a duo rate up with Arthur which is still a good 6 months away. Soooo question is do you want to wait that long?
If you plan on rolling for Arthur too thats a really good deal as duo rate ups all but guarantee the 5* will be one of the two on the banner(0.9% chance of a rate up split 0.5 and 0.4 as opposed to 0.7% on a solo banner), if not it really just comes down to if you are willing to wait a whole year to get better odds as if you're going to role a class based summon this one will be better than any of the future ones due to less other 5* riders.
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