Look i really like parf and i ageee with some of your points..his last month has been great.
But lets remember some facts. We have 6 fwds who are locks (jez tommy ollie plus the 3 smalls) plus dempsey that are all locks. We have 6 or so defenders as locks (even i admit kolo and zuthrie are having great years). Then either stanley or conway plus danger blitz cuthrie and bruhn and holmes are all locks.
That only leaves 3 or 4 spots realistically open.
In that context i dont think you can fit all of atkins parf bowes and oconnor in the side.
And the other 3 are all more versatile.
Atkins can play bull clearance mid or go to hbf and excel at groundballs
Bowes with his height and running power can be a inside mid or a defender (as he was when stewart went off)
Oconnor has good endurance and can play defensive or attacking roles as a mid or can again go the backline.
When you are looking at the 22nd/23rd player versatility and ability to cover injuries is important.
Parf is a super clearance player (albeit disposal by foot is limited) but how many centre bounce attendances will he get in a final with danger blitz cuthrie and bruhn as the starting mids? And where will he be for the rest of the game as he cant play wing or anywhere else.
Now i could be wrong they could keep him and drop bowes or moc but i doubt it.
I think hes a great 1st emergency but needs an injury to get in-its no coincidence his good run has come with guthrie out.
Parfitt plays in front of Atkins atm who is just going.