This is a very good technique especially coming from a judo guy. Roux will correct me but isn't that similar to the wrestler's cradle? idk.. but nice job iskenos we should defintely take a look at that.

To answer your question about T4, tiers is designed to introduce members to concepts in the lower tiers and then advance into a general technique and finally in the advanced tiers you learn specific variations.

Think of it like evolving pokemon
basic suplex -> proper suplex
snapdown ->half throw -> full throw
half throw -> footsweep -> hiza guruma
pin pressure -> mounting/guarding -> guard sweep

as for the bjj tier im not finished working that out.