Yea, you only go to one knee if you feel another punch is gonna put you on your ass or if you're hurt enough on your feet to need an 8 count to gather your thoughts. His chin doesn't worry me (Walker hit him with some bombs and could only get him to one knee) it's his defense. Someone like the Klit's are gonna hit him 2-3 times for everytime Walker did and just as hard.
Put it this way, Chris Arreola stands more chance than Tony Thompson, and he had to take a dive in the end because Wlad was too reluctant to go for the kill.
Technically taking a knee is a pretty smart strategy. I'd much rather my fighter take a knee, get a moment to collect himself and get back up than try to hold on for dear life, expose himself to more punishment and turn an 8 count into a 10 count. Granted yer screwed either way but the former has more of a glimmer of hope than the latter.