Due to item 1, adding an ADU can require years to start achieving any return (once the accumulated cash flow recovers the initial negative position).4) ADUs detract from the existing structure whether this is privacy, a garage, or just yard space. 5) this is related to number 1, but there are many more buyers looking to purchase homes for their family than there are RE investors looking to purchase small unit count properties.

However, he did mention that I should own the LLC 100% or I would need the other person to be on the loan in order to count all of the income.

Count your lucky stars.  

@Joey Gorombey I would just highlight don’t just count on cashflow but also appreciation too, if the area is growing go for it with the numbers

If you go with a landlord, ask them if they can use your on time rent payments to count for building your credit.

I'd recommend that for house hacking you shoot for having all your bills paid and not worrying so much about unit count.

@Chris Wharton @Ashley Cross can you opine on this -Debt-to-Income Ratio: If I'm an authorized user on a credit card does that show up on my DTI even if I don't use it? 

I try not to read any newspaper(libs control;) or magazine( I do read Scouting and Rotary News, but I'm guessing libs wouldn't count those.

After a certain period of time, they don't get counted in your score anyway.When you've mastered your credit, you should save money for both a down payment and for reserves.

According to two different lenders, the amount of this transfer counts as income as long as it has occurred for 3 years and can continue for 3 more years.