Hard to say what posturing went on but it's not out of the realm of possibility that Philbin agreed to fire Sherman if Ross agreed to fire Ireland.
Neuter or fire has the same result and doesn't change that there may have been an agreement between Ross and Philbin concerning Ireland and Sherman. Not saying there was but again, is conceivable.Ross didn't fire Ireland, he did professionally castrate him though and Ireland said he wouldn't stay under those conditions. Ross may have told Philbin although he has power to hire and fire his staff that Ross could take care of that by letting him go if he doesn't replace Sherman.
Neuter or fire has the same result and doesn't change that there may have been an agreement between Ross and Philbin concerning Ireland and Sherman. Not saying there was but again, is conceivable.