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I wanted to update you, thanks to "So You Stink You Can Dance", I now conclude that Zeke became a Wagstaff student in 6th grade over 5th grade. It's thanks to Leslie getting his spirit crushed by Spencer that I was able to figure it out. Given Leslie can drive, is not much taller than Jimmy Jr., and I assume around the same height as Logan, the youngest he can be is 16. He also could probably be 17 or 18 but I'm going with 16 for now. I believe he would be much taller if he was in his 20s. Leslie used to love dancing and Zeke has a video of him on his phone his cousin dancing at the age of 13. We find out that Leslie tried to take his dancing to the next level "a few years ago" so it is at least more than 2. Since this is the first time Jimmy Jr. is hearing about Leslie getting crushed by the same man that he is going to get criticism from, Leslie had to have been rejected before Zeke went to Wagstaff. If he was rejected when Zeke and Jimmy Jr were already friends, you know Zeke would have been talking about it with JJ for comfort so it wouldn't make sense for JJ not to already know the story before the episode.
So my timeline is Leslie got the brutal criticism at 13 (to be fair, he could have been older when he tried out, but I think the intention of the episode was to show he tried out at the same age JJ and the rest to parallel his situation) while Zeke was 10. Zeke's family moves again when Zeke turns 11 and the scar of Leslie getting his dancing spirit crushed has faded after a year. He goes to Wagstaff in the 6th grade and meets a new friend with a passion for dancing that reminds him of the passion his cousin used to have and they immediately click, much to Tina's dismay.
I prefer 6th grade to 5th grade for Zeke anyway because it shows Tina's original disdain for Zeke in his fist appearance was fresh but not too fresh when it comes to him taking JJ's attention from her.
I have been rewatching some Bob's Burgers episodes and now I am going to show my headcanon of when Zeke first came to Wagstaff. TLDR version, I think Zeke became a student at Wagstaff between 4th and 7th grade. I think my safe bet is either 5th or 6th grade unless I find more evidence. Here's the evidence of how I came to the conclusion. So we know that Zeke wasn't there when Tina, Jocelyn, and Jimmy Jr. were in third grade because in the episode, "Can't Buy Me Math" Jocelyn immediately reveals that she remembers "the pee thing" while neither Zeke nor Tammy comment on it (Also wanted to bring up I know Darryl said 2nd grade but keep in mind he's a grade lower than Tina and the rest). Tammy doesn't because she wasn't there when it happened because she became a Wagstaff student in 8th grade. Jimmy Jr. left before we could ever find out if he remembered. Tammy and Zeke would have definitely commented on remembering it if they knew about it, one being more malicious about it than the other mind you.
So to me, I think it's safe to say that Zeke wasn't with them during third grade. I don't think Zeke was in Wagstaff in 4th grade either because in the episode, "A Fish Called Tina" We get a flashback of 9-year-old Tina with other students. Jimmy Jr. and Jocelyn are in the flashback, but not Zeke. Lastly, in the episode, "A Few Gurt Men" it is revealed by Mr. Branca that someone tried to flush down three spoons last year, which Zeke apologized for. So it's safe to say Zeke was with them during 7th grade and didn't just recently transfer to Wagstaff in the 8th grade like Tammy. So because of the evidence I gathered so far, I think between 4th and 7th grade is when Zeke moved and became a student at Wagstaff.
My guess is 5th or 6th grade until I see something that contradicts it.
Let's go!!!