You perople are underestimating the WC. Remember Ebaneezer was way down the line, and that there were loads of different names, every1 absent before they got down in the list down to him when he entered the SC. So there are loads of wizards of SC level out there that simply haven't entered SC due politics.
(Or am I completely wrong here?)
That's a very sensible question.
However we have a quote saying the SC is peerless in power:
An offensive action like a full assault from the Senior Council, the seven oldest and strongest wizards on the planet, had been long overdue.
So McCoy is in the top 7. However, that's in direct contradiction with this scene:
Peabody reached under his table and came out with a bulging satchel. He muttered something to himself and rubbed some ink onto his nose with one finger, then he opened the satchel, which held what looked like a couple of reams of parchment. His eyes glazed over slightly, and he reached into the papers seemingly at random. He drew out a single page, put it on the desk before him, nodded in satisfaction, then read in a reedy voice, "Wizard Montjoy."
"Research trip in the Yucatán," Martha Liberty said.
Peabody nodded. "Wizard Gomez."
"Still sleeping off that potion," provided a grey-cloaked Warden standing by the wall.
Peabody nodded. "Wizard Luciozzi."
"Sabbatical," said the blue-bearded and tattooed wizard behind me. Ebenezar frowned, and one of his cheeks twitched in a nervous tic.
It went on like that for close to a quarter hour. Some of the more interesting reasons for absence included "He got real married," "Living under the polar ice cap," and "Pyramid sitting," whatever that was.
Peabody finally read, with a glance up at the Merlin, "Wizard McCoy." Ebenezar grunted and stood. Peabody read another half-dozen names before stating, "Wizard Schneider."
That would mean a least a hundred wizards before McCoy on the seniority list.
That's simply not possible, as I cannot see how no one among those one hundred would accept a position as prestigious and powerful as SC member.
In my opinion, there are two ways to reconcile those two scenes:
- Out-universe: the Summer Knight scene was written as comic relief ('pyramid sitting', 'real married'), and is factually incorrect.
- In-universe: the nomination to SC is in fact the result of a political struggle behind the scenes, and the seniority list thing is just for show. So there may be a hundred wizards older than McCoy, but none of them had the magical/political power to challenge him for the seat.