However, it is possible that the Ontario Plumbing Code allows the kitchen sink to be at the upstream end and drain through the wet vent. I'm not very familiar with that plumbing code, so you may need to get a local opinion. But if this is your plumbing code:
Then Section 188.8.131.52(f) has the requirement that "the total hydraulic load on the wet vent does not exceed the limits stated in Table 184.108.40.206. when separately vented branches or fixture drains in the same storey, having a total hydraulic load not greater than two fixture units, are connected to a wet vent or a wet vented water closet trap arm,"
So that seems to allow arbitrary separately vented fixtures to drain through the wet vented section, up to 2 fixture units. [Unlike in the US, where only bathroom fixtures can drain through a horizontal wet vent.]
And Table 220.127.116.11 Line 23 says that a kitchen sink is 1.5 fixture units.
Thus if I haven't missed anything, the kitchen sink is not a problem for your code. But there's a significant chance I have missed something, not being familiar with Ontario code.
Then for the US codes, having the dry vented lav as the last of 3 bathroom fixtures wouldn't be a valid wet vent, it would need to be first or second. But I will study the above a little more to see what the Ontario code has to say.