LogFAQs > #929051537

That one definitely felt like it took a while for me, too. And Caspar was part my core party in my playthrough so there should have been plenty of incidental support points gained in battles even when I wasn't focusing on it.

I don't think the data is out there on points needed to rank up (at least it wasn't on Serenes last I checked) but it could operate on the same theory LotM mentioned with Edelgard. Namely, the fact that Caspar's B support with Byleth is post-timeskip means that you can't even start on building points towards it until after the timeskip, whereas with almost everyone else they can hit B pre-timeskip and so you can be working towards building points for A much earlier - even if the actual convo itself has to wait for the timeskip.

Past Fire Emblems have certainly had supports with varying "speed" to them. (Like B->A would always be 80 points but for some characters anything that gave points would count as 2, or 3, etc. instead of just 1; Usually had to do with support pairs that made sense, like childhood friends or whathaveyou)
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xp1337: Don't you wish there was a spell-checker that told you when you a word out?