To give a more definitive answer to this; yes and no.

If you have Adsense right now, keep it in good standing- if it becomes disabled, you will not be able to become partnered with
any network. If you
don't have Adsense, don't enable it unless further instructed to by the network. For some networks, it's necessary that you have your videos monetized with Adsense before you can be partnered, however, this is not always the case. So wait on the network's instructions on enabling Adsense, since they always know best.