Krishna is really mischievous, but He is the submissive younger brother of Balai Chandra. So no need to fear. Baldao has got everything under control. That trickster cannot escape if we have got His bhaiya! Well, Baldao is lenient about Krishna doing naughty mischief in our heart though. He pushes Kanu for that (and sometimes gives a hand too). But the part of trying to escape from us is a big no no!
It is described in Bhakti Rasamrita Sindhu by Srila Rupa Goswami that devotional service is the only means to attract Krishna.
Krishna is all-attractive, but pure devotional service attracts even Him. This means that pure devotional service is even transcendentally stronger than Krishna Himself. Nitai is the personification of this devotional service to Gaur Krishna. So we can conclude, from this logical understanding and from the direct statements of Gauranga Mahaprabhu, that indeed Nitai’s position is not only equal but more transcendentally potent than even Krishna. Nitai is the rope which we must grope onto in order to bind Krishna.