(Yes some Government sponsored entities may require it, but there is no general law requiring it.)You just  need to look around for bank that don't require seasoning or define it in a way that you meet the requirement. 

Syndicate – this in my mind should be done by sponsors that have experience with small multi-family at a minimum.

I plan to start with a house hack and building a portfolio primarily with the BRRRR method with hopes of one day sponsoring syndications.

that works you could do a basic LLC and have uneven distributions which is the major benefit to the LLC.. the LLC lends the money you have 2 or 3 buddies as members.. you the sponsor be the managing member.. then cut the pie however you like.. when I had my shops I did this through guidance lines with my banks.. we put the cash out for the loan.. then back filled and pulled from our guidance line.. for every 1 mil in cash we had we got 4 mil from the bank..

They go to and sponsor many local REI events and host one of their own.

Andrew is an engineer and has held senior executive roles in several Fortune 500 companies, and he has established himself as a local top multifamily real estate Sponsor over the past decade.

I have studied many types of Equity structures in a syndication scenario with various types of preferred returns, equity hurdles, and more, however I have not been able to find anything about how a sponsor can buyout the equity limited partner in a long term hold scenario.

When a sponsor starts putting more and more deals together they sometimes start a fund.

Disclosure: I am a student at Western Governor's University but I am not sponsored by the education system. 

They offered to pay for my realtor's license and classes and to sponsor me.