No, I think that even if she was 18 or 19 at the time his behavior would have been predatory. Powerful people seeking out young women for sex parties is a predatory action, full stop. The difference between her being 17 or 18 is not a question of 'predatory vs not' but a question of 'legal vs not'. If she was 18, he'd still be kinda a shitty person for it, but he wouldn't be breaking any laws because it's not inherently illegal to be a less than perfect person. At 17, in that state, it /is/ illegal. Which means he's both a bad person AND he broke laws in the process.