Someone hasn't been keeping up with the BG changes. All BGs are now set per 5 lvs (x0-x4, x5-x9) to prevent that sort of match up.
This someone doesn't usually do BGs, as you can see from my history.
I think I did 5 yesterday, which is the first time I've been in any BG for 2 years.
It was only an exploit if they used wall-jumping to get up there. That's beside the point anyway.
Relative level guards would be fine, I just don't see that happening. That's kind of how it's supposed to be now, but I don't think they're going to code in level 73 guards to come if you attack on a level 73.
If the guards are unable to path to you, it's considered griefing , and an exploit.
Have the guards spawn with a level in multiples of 5, rounded up.
Level 45 Attacks something, Level 45 guards spawn
Level 46 Attacks something, level 50 guards spawn.
Level 47 Attacks something, level 50 guards spawn.
Level 48 Attacks something, level 50 guards spawn.
It'd at least give you a chance to run away, instead of being one shotted one or two times as you try to corpse hop away.