I never delisted mason wood :| just to put a cat among the pigeonsIt isn't different to Mason Wood - Mason Wood can't be selected either based on what is written above.
I would have selected Mason Wood if I thought otherwise (and I even emailed Ultimate Footy to find out when he would be added to UF - buggers never replied )
On your other points re McCartin, keeping a player you have already is different to trading in one who has never been on your list - like Gallucci this off season for Zim
If we want clarity, I say make it a simple blanket rule if a player is not on the UF player list, he is not available to keep/trade or draft.