Sparky,
Wouldn't get too "het up" over this one. Part of my normal duties is to review any schedule and cost changes claimed by subs - usually electrical, but not exclusively. I doubt that team has the same staff that we do, but all we're looking for is a rational explantation.

BTW, their gonna argue, you're gonna give a little, win a little, and both of you will claim the win. Just the way the game plays in 21st century construction, another one of the things I love so much about it [Linked Image]

You're likely to feel "beat up" after this, make sure they feel a few licks too, but again it's a normal course of business, likely it's the one class they remember from college.......except for their CPM courses.