I haven't secured any loans from anyone before so I'm not sure if I should try to get the lower rate on the majority of the price and hard money on the down payment?

There are also services that will keep your collateral files secure for a fee, so that may also be a good option. 

This webpage is built around Kiyosaki's idea, so it got my attention, since they (Luis, Eduardo, and Pablo) claim to have found the solution on how to apply "Rich Dad, Poor Dad" technique to the Mexican reality.

If this is the case, then do an inspection to verify it is vacant and in good condition prior to any money changing hands.Make sure the security deposits and prorated rents are transferred to you.

Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

I have an appt this week to set up the bank account for the security deposits and the monthly rents. 

You aren't allowed to secure the house during the closing period.

If they don’t respond or react quick enough in this market, how do I know that they can secure what I want when time is of the essence?

Upon final walk through found out 1 tenant was applying for rental assistance, this tenant never had a security deposit but the question is not about that tenant.The other tenant supposedly had a $1,000 security deposit.

Also, what did the seller do with the security?