Bitcoin bull run is from itself and Ethereum does not contribute to bitcoin bull run.
Ethereum has it's own bull run and it has no contribution to Bitcoin's bull run it is to each it's own, and besides Bitcoin dominance over all the coins makes it superior and no altcoins can add or contribute to it's status, all altcoins are still under Bitcoin, if Bitcoin crash the altcoins follow.
The thing that has happened in the last few months, is that all altcoins are still very much affected by the movement of bitcoin and cannot escape. so that when it goes up, altcoins also follow but when they go down altcoins also can't escape. all of them are still heavily affected by bitcoin and cannot escape.