Reference for Gittin 34:4

אמר לך רבי יוחנן אליבא דר"ש לא קאמינא כי קאמינא אליבא דרבנן

But on the theory of R. Johanan, what is R. Simeon's reason for declaring such a Get valid?<span class="x" onmousemove="('comment',' Seeing that it gives him an improper opportunity of shielding his sister's daughter. ');">⁴</span>

Jastrow