God brought forth His pure word thru holy but fallen vessels, and there is no necessity for a sinless vessel for the word made flesh.
Though believing He did use one is not a salvific issue by itself, it does militate against the normative use of “all,” as well as the principle that notable exceptions about important characters are made known, from having more than 10 toes to being sinless, and thus Christ is at least thrice stated to be the latter. (2Cor. 5:21; 1Pt. 3:22; 1Jn. 3:5; cf. Jn. 8:46; Heb. 7:26)
Just FYI, I’m more in the “fitting” camp than the “necessary” camp for the Immmaculate Conception.