Lock Patrick Tuipulotu was next best with 13 tackles for the Blues.
"We talked about our transition defence and getting up and shutting down Cooper and bringing line speed and I just tried to lead the line and put some real heat on there," he said.
"It's a bit frustrating sitting week in and week out on the bench. I just have to take my chances when they come but I was pretty happy with the way I played last week and luckily enough I have another chance and I've got to make the most of that.
"It was my first 80 minutes for the year so it was pretty tough in that regard but I think you just have to plan every week as if you're starting so if you happen to be in there last minute you can do your role and do it confidently. It is hard to get a rhythm when you haven't been playing week in, week out, but you just have to take your chances."
O'Connor played only twice for the Crusaders, both off the reserves bench, despite being on the Christchurch scene for a couple of years.
He said he had no desire to further his career overseas, saying he was prepared to fight it out in New Zealand, and his profile will receive a big boost if he shines against the Chiefs' loose forward trio of Sam Cane, Tanerau Latimer and Liam Messam in New Plymouth tonight.
"If you watch them they go well at the breakdown and thrive from there. We've just got to do a similar job to what we did last week which is bring our defensive line up and be really physical and bring that attitude.
"It's good that we've won two in a row now, it's momentum. Winning becomes a habit.
"The more you win, the more belief you have got. The belief is certainly there now and we've got a lot of confidence."
Playing alongside Kaino and Saili - with Luatua in reserve - should give O'Connor every chance to press his case.
"They bring a really physical game. If we can bring a really physical attitude that frees me up a bit more to really attack that ball."