They both displayed auras. Vegeta might have been like 470,000-480,000 but pushed beyond his limits and reached 500,000 for a short burst, and maybe that's why he was out of breath.
The way I see it is that Casca was on the brink of losing her mind over the horrors of the Eclipse, so she most likely took whatever opportunity she could find to escape from the trauma, and she likely attempted to find sexual pleasure over being raped by Griffith.
I like the Base Boys both being slightly weaker than Piccolo better than the Base Boys = #18. It's a good middle ground because they share evidence of being near both Base Gohan and #18, and Base Gohan is definitely >>>>> #18, and Piccolo came out dominant after Gotenks Boo defused.
So do I.
I have:
Kibito Kai >>> Base Goku > Yakkon >> Base Vegeta >>> Base Gohan > Pocus > Kaioshin > Kibito > Piccolo > Base Trunks > Base Goten >>> Android #17 > Android #18