How will you know if he/she is legitimately over or is sucking all the profit out before investors get their cut?

It's legitimate.

Is it a legitimate way to expand a big faster ?

They want real offers coming from a legitimate source.

I'm newish to RE investing and want to verify if what the Listing Agent told me is legitimate.

This is a legitimate situation so you definitely should discuss with your CPA.

Even if this is all legitimate, I don't think we are starting off well and I don't want to have a poor relationship with my landlord.

To my knowledge, legitimate Unicorns are not for sale for any amount of money.Turnkey properties rarely have the best rate of return but they are typically easier to maintain.  

I just research the heck out of anyone that I work with if possible....even if they were legitimate, I don't want to accidently help a terrorist etc. move money around.Here is the website if curious: www.cristalnaturalminerals.com

YOU are "collections".If you have a judgement for money owed, then yes, irrelevant of the circumstances you can HIRE a collection company who will keep most of the money and very likely not collect any at all.Actually, if a tenant leaves and legitimately owes you money, you actually can turn the debt over to collections.