They most often need to get there engineer out to the site, check city zoning, city restrictions, water and sewer access ( this varies wildly from site to site). 

Also you will have general admin, legal and accounting. 

Any legal/tax implications from this type of deal?

You may think you are not "representing" them, but by law you would be considered to be acting as their agent, though illegally.Just because someone writes up an article and puts it online, that gives you instructions on how to do something doesn't make it legal.

But I doubt this is the case from the sounds of it.I have purchased properties before where there were incredibly complex title searches, where multiple estates were involved, heirs died without a will, hand written deeds in the chain with incorrect or incomplete legal descriptions, etc. - and in instances like these, I've paid the closing attorney upwards of $1k - $2k just for his fee alone.

They’re both executives can I legally close this deal it’s a really good deal for my first flip.

Do not rely on it for legal advice.

You may already know but make sure that your primary lender restricts that. 

It's certainly not legal here in MA, but I don't know OK law on the topic.If that was all there were to it, I'd say that's a risk you take in wholesaling. 

Check out my personal favorite, Every Landlord's Legal Guide or The Book On Managing Rentals before you get too far into this.