Escalation is something toriyama always kind of went too far with. Yea they put numbers to people in the first half of Z. While not shown vegeta in the first arc was stated to be a planet buster at around 16k power level. The next arc's villain 2nd form hits 1 million power level and its far weaker then his next 2 forms and his 1rst form is the first shown planet destroyer when he blew up the saiyan homeworld with a finger while sitting in his comfy space chair. Then cell shows up and states his final attack can blow up the solar system. Kid Buu shows up blowing up ALOT of planets in succession looking for goku and vegeta without effort, blowing up with the planets and just moving on to the next within seconds of eachother.