Remember your grade depends on your % performance compared to all other players on that champ in that role, not on the absolute numbers. Since you didn't get an S, it just means that enough other ezreal players were managing what you did, but even better.
Ezreal has a very high skill cap, so the S level performances are really quite good. (Also, besides your cs, I have no idea what your objective participation was like, or how well you warded, or various other things that go into grade.)
That CS is garbage for 22 min tbh
and where is your tear item..? jw
Im not the best at csing with ez as I play him like zed. Second, I dont need tear as i rather just burst someone quick in an all in
The tear gives you more mana and damage with manamura
You can sustain in fights longer with more mana
CS is very important for an S
maybe he focused on the enemy opponents 16/1 well...
How many wards placed? Towers taken by you?
I've tried looking up your game on Replay.gg but I can't find it there, your games on their site seem up to date but its just not among those listed, this might be due to your account not being registered there.
You could try registering if you want, I can't guaranty that it will work but if it does I'll look at your game and give you my opinion on it. I'm just some unranked scrub who mostly plays aram, so I don't know how valuable my opinion is to you but it would be of benefit to me if I could watch the replay.
Link to Replay.GG: http://www.replay.gg/ Link if you need help to register: https://www.youtube.com/watch?v=IGEI2BKve0M