If I've read your posts correctly, I think you're saying that, rather than cast on all your stitches to one needle, and then slip them to the other needles, your neighbor knits them onto the other needles.
If that is the case, then that works just as well as slipping the CO stitchs, or even casting them on to the different needles from the get go. Whatever you're more comfortable doing! I've done all three ways, and I don't think I'd be able to tell the difference, if I didn't already know!
Like Five_Six said though, your 'seam' (where the last needle meets up with the first needle) will be one round off, so all you'll need to do is take the CO tail when you're done, and just seam up those two stitches on the first row.
It's pretty hard to do knitting 'wrong', if the finished product looks similar to other methods!