Why wouldn’t it be? If it suits your goals, do it. Just don’t make the mistake a lot of guys do and over-focus on just the lifting. Conditioning work is always part of 5/3/1. Do them, fix your diet, and you’re set.
Dude, I’m sorry, but you’re not “skinny”-anything right now, like mben said.
What did you weigh a year and a half ago?
Five months ago, you said “I have a 185 bench a 210 squat and a 280 deadlift”
Why have your bench and squat not moved at all in that time?