Many look down on kidnapping since it's illegal and all, but it's an art! In fact, there are many vital points to such an activity:
1. Pick the right mark.
2. Strike swiftly and without hesitation.
3. Remain anonymous during the entire process.
4. Accomplish one's goal without getting too distracted.
Honestly, most people fail at point 1 or 4. One needs to know one's limits when deciding on who to target. This point wasn't too much of an issue for Josh since he aimed for A-Ranked Climbers, not even S-Ranked!
How would they have felt if they knew his current thoughts? In the eyes of the world, joining an A-ranked guild was prestigious and meant one had won at life. Perhaps only an aberration like Josh could consider joining an S one easy.