If not, then this is a big barrier to overcome. 121 of the 612 sales were cash.

What are the challenges and how do I overcome those challenges?   

Tax accountants (and lawyers) also tend to be extremely risk adverse so they tell you to do one thing after another to lower liability even if it doesn't always make sense from a cost/benefit way of looking at things given that, as we all know, time = money. 

Buying a home is the best Investment you can ever do, owning your own home, having the equity and most times its cheaper than rent.How do I overcome the rate, by paying the principal down!

I agree with your thesis...deal flow IS real estate investing.Baseball is good training for REI...takes discipline and persistence after adversity. 

They might offer insights on overcoming doubts and building confidence as you navigate this new venture.

Coordinating efforts with our partner, Jamie Munden, was crucial in overcoming this.

There were a lot of hurdles to overcome with this deal.

This allows the sponsor to buy a nearly $50M property with just a few million of investor equity--but it provides zero resiliency to an adverse market. 

It's an area where some struggle (especially in the beginning), but it's certainly overcomeable - and it's something that can definitely get easier when you get more established, learn how to advertise effectively and build up a buyers list.To put it as simply as possible, I'd say it's ultimately a matter of:Buying the right properties in the first place.Offering a compelling price point (which usually isn't hard, if you buy it right).Compiling the information well (with good images and descriptions).Getting your listing in front of as many eyeballs as possible (and keeping it visible).If you're able to, provide the option for seller financing, so buyers have more ways to buy your property if they're unable to get the cash from another source.Does that make sense?