Gopinatha Simha was Akrura, as stated in the Gaura-ganoddesa-dipika

Expressions researched:
"Actually he was Akrura"

CC Adi-lila

Actually Gopīnātha Siṁha was Akrūra.

CC Adi 10.76, Translation and Purport:

Gopīnātha Siṁha, the thirty-eighth branch of the tree, was a faithful servant of Lord Caitanya Mahāprabhu. The Lord jokingly addressed him as Akrūra.

Actually he was Akrūra, as stated in text 117 of the Gaura-gaṇoddeśa-dīpikā.