Sucker Punch is used on like, one B- mon and is easily resisted by Tera Fighting. Which legion likes to run for ekiller anywaysFair. The main thing that Basculegion has over Basculin is much higher attack and unpredictability in Tera Type. Basically, if you're forced to run Tera Ghost that means Sucker Punch is actually reliable counterplay. This also means Basculin won't be killing the likes of Ting-Lu and definitely not Ekiller easily like Basculegion can. This is more than enough to make Last Respects a lot more manageable in the builder in the eyes of people who want Basculegion banned. Basically only teams without Sucker Punch or a Dark/Normal type would be *forced* to run Tera Normal on one mon, if that. That's why I still believe only Basculegion is the problem (for the people who want it banned). Also due to the much worse bulk, HDB and Scarf sets become quite a bit shittier.
Still I think that you getting reqs with Basculin is impressive and also very funny.
Ekiller and ting lu are the only decently splashable dark/normal types. the former can't be fit on every team since many teams would prefer a different arceus form while ting lu dies super hard to water stab, fighting tera blast, and often needs to lose a shit ton of health trying to beat Miraidon
Tera Normal is a massive waste of a tera type, it's not good for like, anything else. That also assumes you don't burn your tera beforehand and with the sheer amount of threats in the tier, it's very difficult not to.