It was their raid and they didn't want a striker. Way back when during TDB I decided to move away from three warlocks. I knew I wanted to raid with my new hunter and titan so I leveled the defender and blade dancer classes first. I also didn't go into the raid until those sub-classes were maxed. This really doesn't take that long. So if you want to raid and don't want to start your own raid team then have what people are looking for. I actually ran a raid last night with three titans, one of whom only have armor of light unlocked. We got it done but it would have been better with a blessing bubble a few times. My first raid of the week we had a titan who didn't have illuminated unlocked and they were struggling to get the ogres down. It just makes the raid easier for everybody if your titan have a fully leveled defender class.