I don’t believe it was the previous Satmer Rebbe who bought the ALREADY FRUM Teimanah to America and Kiryas York, I think it was the current Satmere Rebbe. But it doesn’t matter which Satmer Rebbe it was, the Teimanah were already frum, there was no seeking to make them baalei teshuvas, only to give them an opportunity to continue their mesorah. I think the previous Rebbe bought some Argentinians to KJ, but again, they were frum people prior to their arrival in KJ as well.
Teimanah and Argentinians who didn’t shtell zich tzi to the Satmere rules, they couldn’t fit into the Satmer mold, weren’t welcome anymore. I’m not saying it in a way to bring out any negative aspects of either the Teimanah, Argentinians or the Satmere, I’m just saying that the Satmere are very on top of keeping out influences they don’t desire.