Imagine that the average gymrat already feels skinny and like shit when he wasn't in the gym for one week and lacks the pump in the arms and delts.
How must Ronnie feel mentally looking at himself nowadays, who was the freakiest BB in the world at one point and looks like a saggy sack of shit these days. Srsly, that must f*ck him up psychologically 

You sound like a very weak minded person.
Weak minded people like to fantasize about the people who are no longer the apex of what they are doing. They revel in it. They post threads like this.
Strong minded people just keep going. They understand that the only thing to do is keep moving forwards. If you go back, you just start again, keep moving forward.
Strong minded person like Ronnie just keeps turning up to the gym.
Any time Ron likes, he could get back on the special sauce and blow up - but I suspect he is unable to (at the very least right now) due to his medical difficulties.
Yet he still keeps going.
He is one of the only pro's I've seen who are prepared to post anything of them looking small. Who are prepared to train as much as they can, post retirement when they are looking like shit (and post it on the internet).
What must he think when he looks in the mirror and sees himself now? He will see progress from last week. Just a little. But that's enough.