Just as some people are short and others tall people produce different amounts and proportions of hormones which leads them to put on muscle easily or not.
For the most extreme ethnic examples of this consider the Kalenjin of East Africa who are skinny and wildly over represented as marathon runners and Polynesians who are wildly over represented as rugby players and in US Football, who are more muscular.
In my experience, you won't experience muscle loss for up to like ~2 weeks as long as you eat your daily calories including your protein requirements. Going on a calorie deficiency is a big problem for your muscles; hence if you want to lose weight after gaining muscles, you should lose it slowly and include daily protein in your diet.
I know this because I measure and keep all my metrics as I'm a data geek as well and I've had several periods where I had to stop (vacation, family, etc).
Also, I agree with everyone else, I've noticed that consistency is king. You can pretty much take any strength training program you want and it will grow your muscles assuming that you get enough protein, calories, sleep and keep lifting heavier (or the same weight if you want to maintain).
Just my 2c.
After two weeks without training and while eating a shit (but oh so tasty) diet and drinking wine everyday for one of those two weeks, I lost about 20% of strength on the main lifts. And it felt way worse than that. But it’s just a temporary loss, and I was back up after a couple of weeks.
My unsolicited advice is to not worry about it and just start from what you end up being capable of after a break. It probably is not your first, and it definitely won’t be your last because life happens.