Just coincidence, yes. Personally, I would rather the luck/variance roll past quicker. If bad luck must happen (and it must) I would rather get past it quickly than wait more than a week for a block. Thus, I prefer a higher hash rate.
The only time I get nervous about high pool hash rate is when a lot of it is rented hash. I'm going to qualify this by saying that I see no evidence of what I'm about to mention happening in the real world (our long term luck says that it isn't). That said, rented hash does come with the possibility of reducing luck since the actual rig owner no longer has a stake in the pool payout (only the renter does). Using the West/NiceHash as an example (only because I'm most familiar with them - not because of anything specific to them), the rig owner selling hash to West/Nice has no incentive to actually submit block solves since they are being paid PPS. They could withhold block solving shares without penalty. In fact, they have incentive to not submit solves since it helps keeps difficulty lower and indirectly their PPS rate higher! The renter, who has the actual stake in the pool, has no way of knowing a block was withheld and pays for the broken hash. It is a risk that has kept me away from renting hash every time I've considered it.
So, there is one real possible way that higher hash rate could be a bad thing, but as far as I know I've never seen it in action.