I guess it depends on what you mean by lock in. I lock in with the drummer and primarily listen to the bass drum, but I play complimentary to it, I don't play the exact same thing the bass drum is playing. I play in a guitar/bass/drums/singer configuration and although I pay more attention to the drums, I also listen to the guitar. It's a balancing act and IMHO if you ignore either the band won't sound tight.
