Here's my 2nd answer:
If someone else is trying DoSing you over the Tor network there is a chance that this will be prevented from the guard relay. If not it could be an advantage for other relay operators because the traffic that flows through the network goes up to their score.
If this someone is DoSing you over the normal internet I see no chance for other relays to get the guard flag faster except one thing: that the clients are using other relays for their traffic instead of yours so you are missing it because of unreachability.