Reading what
@Para_33 has done in the past, alongside watching some of his recent YT appearances, he certainly saw great results with exogenous E and using Primo, Deca, Tren and Boldenone solo or in combination alongside it as the main compounds.
Granted, two of the cycles he recently ran were 3g Boldenone Cyp, and 1.9g Boldenone Cyp with 900mg DHB. I've noticed he has always ran high doses, so the question of whether his idea on SHBG reduction helped speed the gains up, i'm not so sure of considering his dosages are so high anyway.
But he's always had a point about using exogenous E2 to at least guarantee one thing; once you get your ideal injectible E2 dose dialled, no f*cker is changing that and you can guarantee it's stability and dose non-aromatisables however you want. There is something to be said for that alone, regardless of whether it's actually a 'better' option for gains. I think I'm going to try it myself just to experience it.
Granted, just to make it clear, he does acknowledge he's not claiming it's only way, nor that the SHBG reduction from avoiding testosterone were the primary cause of his rapid gains - just so I don't misrepresent him.