not the highest overall. The first confrontations betweens cena and rock blows punks and rocks out of the water.
You have to compare when they first meet each other. NOt when they already had a year long rivalry lol. And even then they broke the all time mania record.
Comparing when they first meet each other isn't a very thought trough comparison. When Rock came back to challenge Cena it was so much bigger news since he had been gone far longer and hadn't had a match in forever. Now he's coming back a few months after he's had a long feud and matches, which isn't even remotely as "fresh".
The best comparison is probably to do some middle of the feud ratings for both. That's still beneficial to the first feud since it had been so long before that, but it's a much more fair comparison and therefor more telling.