That variation needs to be reconciled. 

Anytime I get bids on projects, I get a wide variation of prices for the same work. 

If you go to MO Secretary of State business search and put in Either his name or his companies you will find that he's had about 12-15 businesses all with variations of the same name and only one or two are active. 

., however there are significant variation in the implementation (for residential financing).  

Afterall, you are managing your properties.I actually use some variation of that myself with a name followed by "Property Management". 

Typically the response is a variation of "hell no" or "put it in writing".

It sounds like what you want to do is a variation on the BRRR idea (Buy, Renovate, Refinance and Rent).  

I'd like for investor 1 (the key employee) and investor 2 (the experienced business owner) to invest $112,500 for 15% ownership, and I'd like to further buy in with $75,000 of my own money to add 10% to my shares, giving us this ratio:-Me: 60% ownership (additional $75,000 invested for additional 10% stake)-Key Employee: 15% ownership ($112,500 invested)-Business Owner/Mentor: 15% ownership ($112,500 invested)-Original (other) partner: 10% ownership (paid out $325,000) I would be happy with any variation of the above numbers that leaves me 100% in charge, and owning more than half of the company.

You can use some variation of that but you get the picture. 

There are 100 variations and some great threads here on the topic.