The OA itself is not that bad, so imho Blindside is not imperative - but would also do not harm. Not using Blitz and Blindside here was just personal preference.
This guide is intended to be more or less a standard 2h Forcewave Warlord guide (there was imho one before which was however deleted - so this guide should only fill the gap), there was no specific endgame build in mind - just having a nice and relative stable levelling experience. So, more or less, all engame Warlords are possible target builds (spinner, retaliation), forcewave builds are e.g. [1.1.6.0] Physical Forcewave Warlord sr100/75-76 easy farm/celestials - Grim Dawn / Classes, Skills and Builds - Crate Entertainment Forum and [1.1.9.0] Physical Forcewave spammig Warlord - Grim Dawn / Classes, Skills and Builds - Crate Entertainment Forum