Currencies are like real estate and stocks: the biggest opportunities are when their prices are low.4.

If it is only short term, why not go with the HELOC, as long as you only pay for what you draw (only option where you don't have to pay interest on the entire balance up front, and is interest only, allowing you minimal payments until you finalize and sell the flip, providing for the biggest cash flow of all the options. 

The biggest things I look for are previous evictions and debt to income, do they make enough to pay their rent?

Biggest issue you've identified - Investor A has to own real estate to sell and 1031. 

In the USA, depending on the market, you don't run into as many hurdles.

The biggest challenge has been being oversees for a lot.

Yet they don't follow up.So -- biggest advice I can give:  Don't be like those guys.   

But, the states have every intention of going after the biggest offenders and making giant examples of them.

The biggest challenge with BRRRR is Refinance aspect.

Value add Multi family are everyone’s favorite, but tough for the new/small guy to get many sellers to make the numbers work in bullish markets and/or to overcome some of the hurdles with larger properties- funds, credit, history, etc.