Can a Nexus 6P be factory reset when screen cannot be used and phone off?

I broke my Nexus 6P screen, so am replacing it - usually I would factory the phone. However, I can't as the screen is completely black. I power cycled the phone, but I am unable to enter the pattern to unlock the phone (fingerprint scanner only works after you enter the pattern after restart). I used Android Device Manager to wipe it, but as I can't decrypt it through entering my pattern, it isn't online, so can't be wiped. **However, does any of this matter if the pattern can't be entered after power cycling?** Surely the device is encrypted so my data is secure. And if anyone manages to guess my pattern, the device will be online and ADB will wipe it. Should I do anything else?