Originally Posted by
PiperAtGatesofDawn
They will not be demoting one ₹44k upgrade to accommodate another ₹44k or ₹50k upgrade. They'll just stop the upgrades.
It's more likely that J is oversold to revenue pax and they are trying to return some upgrade pax back to Y.
Or it could be that a couple of seats are broken & in no condition to be used. So they are sending passengers back to Y. Happened to me a few months ago.