Bonuses for your Rockstar Contractor? (David Greene BRRRR Book)

[Miko Yeo]

Good Day Fellow Rockstars! I have been reading David Greene's BRRRR Book and on a section with the GC he mentions a way on how to figure whether the GC is lying to you regarding the Timeline or not. His Process is as follows:

1. Carl mentions that he can get the Job done at 8 Weeks. You then ask "Are you Positive on that? Just asking so that I can plan around it."
2. Carl now mentions "Alright, 9 Weeks". You then respond "Actually Carl, I'm gonna give you 10 Weeks and a 5% Bonus from Total Job cost if you finish on time."
3. Now Carl will be Ecstatic, But here's the trick. You follow up with "But if you are to go above 10 weeks I will have a 5% Penalty of the Total Job Cost for every week you go beyond the agreed Tenth. I need to be very sure you’re being real with me here, and not just telling me what I want to hear."
4. Now if Carl is Excited and accepts it. It shows that he can really do it at the Set Timeline but if he were to make excuses, stammer or backpedal then we know Carl has been Full of Crap this entire time.

With the above said, Is this something one would still apply when you have found your Rockstar Contractor? And if not, How would you talk to your Contractor about him not having a Bonus and Additional time on a Project anymore? (Do you convince him otherwise for instead of Bonuses and Time you can bring him "More Volume"?)

Thank you & Would love to hear your Inputs Fellow Rockstars! ;)