anabolic/androgenic ratio is pretty self explanatory. It is a ratio, and not a measure of absolute potency. You can have a steroid that is 10% as anabolic as testosterone and one that is 1000% as anabolic as testosterone and they can both have the same ratio.
methyl 4-AD is more anabolic than testosterone, but since it is also very androgenic it has a bad ratio. PHarmaceutical companies were NOT interested in the most potent anabolic agent, they were interested in anabolics with the best ratio. that is because women and children were also in the anabolic steroid market and you do not want these patients virilized.
You CAN esterify 4-AD. However it is hard to purify because of the mixture of isomers prevents crystallization of product.
There are several pathways to 17a-methyl prohormones. You do NOT methylate a dione directly. You can protect the 3 keto group selectively using an enol ether, enamine, or ketal/acetal derivative. After methylation and deprotection you end up with methyltestosterone, which can then be reduced to methyl 4-aD. Or you can methylate DHEA and then do an oppenauer oxidation to methyltestosterone, then reduce to the methyl 4-AD.
Due to steric hindrance, the methyl group is always added in the alpha position at carbon 17, so that is not a problem.
Animal does not know the subject matter, nor does he know synthetic organic chemistry in general. He should refrain from commenting on such matters.