Although we try to limit our Hard Money as much as possible due to the cost.

When I return to the country after my Au Pair contract ends, I hope to live in the property as my primary residence and house-hack as well.I understand that investing remotely makes things more challenging, but I am also ready to be uncomfortable and challenge myself in this journey as I know it is 100% possible.

I would verify as much as possible which is looks like you know income on the tenant and maybe some other stuff too.  

While it is possible to convert an investment property acquired through a 1031 exchange into a primary residence, this requires careful planning.

Your tenants obligation was to pay you on Jan 1, so it doesn't matter if they paid someone else they still owe you...obviously details re: notice and dates all come into play here and from a practical perspective I'd work with the tenant and not move to evict over this.

Is it possible to do DSCR with mobile homes?

I am all for saving as much money as possible in your bottom line.  

Without doing a deep dive explanation on this forum, I will say that everyone can play with numbers to create whatever picture you want.

In fact, many of our clients will concentrate their cash into one of the purchases and even purchase it with no debt if possible. 

I worked more hours than possibly anyone I knew.If you do not want to work hard, then value adds may not be the best path for you.