My ultimate goal is to learn what investors are looking for from me as a wholesaler?

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You'd ultimately break even just to keep the lights on. 

I have heard though that most lenders don't mind this as long as it is not changing the ultimate owners on the property - such as a partnership where one person sells to the other.

He ultimately refi’d into a loan that felt hefty at first, but it freed him up to add another unit in the building.

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To decide, consider your ultimate goal, manage more tenants, and analyze potential fourplex properties to compare their returns.

Quote from @Tiffany Henning: I am in the same situation but ultimately will most likely go with Seth Williams because it is not necessarily a money-making funnel for him but more his heart to help. 

This would be the ultimate goal if you are house hacking to lease all the units once you vacate.

To simplify the scenario I'm envisioning let me put it this way: what does a BRRRR look like when one of the parties contributing to the down payment and rehab costs ultimately ends up being the renter as well?