Nah man I gotta push back on that... the ground guy has one job and it's to watch the load and communicate. If that radio lag was known they should've had hand signals or a spotter. Every site has bad layouts that's just the reality of construction it's not gonna be perfect. The foreman approving a material stack doesn't excuse the ground guy from walking the path first and calling it out before the lift starts. Sometimes the lowest paid guy gets the blame because he's the one who dropped the ball on his specific task... not because of some grand conspiracy.

Ngl, that's exactly why I lean toward hourly for anything with 'revisions' in the scope. Flat rate feels great up front but it can turn into a trap when clients think endless changes are included. Mixing a flat rate for the initial concept with hourly after that might be the sweet spot to keep everyone happy.