You somewhat made opposing conclusions on the same subject matter. You mentioned stacking epi and test and though they both compete for AR there is synergy. But later you sort of answer why there is synergy on accident by saying .... .... test does other "things" via more pathways. Will either SARM do anything different via any other pathway verses any other SARM?
What I am doing now is an 8 week on, 6 week off, 8 week on of Ep1c/Ostarine, off, EP1C/Ostarine/LGD. Ill definitely know if there is any major variance but ill need lab tests to determine minimal differences.
I don't see opposing conclusions here. Epistane and Testosterone are synergistic. I don't have a human study to prove it, but we see it anecdotally. As we do with essentially all logs stacking/combining AAS/DS/PH/SARMs. To the best of my knowledge all AAS/DS/PH/SARMs are Androgen Receptor Agonists. Yes, some may do more than that, some can aromatize to Estrogen, some can bind to Estrogen Receptors and Progesterone Receptors, but for they all hold Androgen Receptor binding in common.
I didn't answer why there is synergy on accident, that is just one example I made, and it was done so vaguely. Not intended to be a definitive answer as I don't have the time to add study citations while at work right now. The point was there is that AR agonism isn't the only means by which AAS/DS/PH/SARMs can elicit anabolism, it's not that black and white of a process.
When you ask "Will either SARM do anything different via any other pathway verses any other SARM?", that is a difficult question to answer. We don't have the same amount of data on these compounds that we do on traditional AAS. But they are typically fairly different in structure, and do seem to have different effects from each other. Just like not all AAS are the same, not all SARMs are the same. It's an entire class of compounds.
Just because Trenbolone binds more aggressively than Testosterone to the Androgen Receptor doesn't mean that it binds to ALL of the Androgen Receptors (which is what one would call Receptor Saturation). And also, just because Trenbolone binds more aggressively than Testosterone to the Androgen Receptor doesn't mean that Testosterone or other AAS/DS/PH/SARMs that also bind to the same receptor will have no synergy, or no effect whatsoever.
I'm stating all of this because people are quick to say 'Don't stack SARMs, they compete for the same receptor' but you don't see that when people are stacking Epistane and Halodrol, or literally any other combination of AAS/DS/PH, and it rings just as true for them as it does SARMs. They are (to the best of my knowledge) all Androgen Receptor agonists. Thus, they will all compete for the same set of receptors. However, you will not saturate them all, as it would take a large amount to do so, so fear of competition is foolish reason not to stack them. If there is proof that there is no benefit to stacking them, I'd like to see it.