For point 1 i think there might have been more players alive after the last return before completion so he was shocked. Given the fortifications that they had in chapter one maybe he was expecting more thriving and less increased destitution.
For point 2 the wizards lacky said that skills are acquired by the actions and high level achievements made by the adventures. If you think about it leap and large leap are physical achievements, while leap into the air is a magical achievement.
I do agree though that some things seem kinda off. Namely how the original only finisher of solo (I can't remember how to spell her name) was able to complete it despite her power clearly not being enough. They said she struggles with S class monsters, but given what the mc has been experiencing and the high level of even early floors it doesn't make sense that S class would be that big of a challenge to her. Sure the mc is just built different, but the maze is not kind enough to allow her to survive with just the stats she showed in the beginning. He never heard her wish, so unless the bezoar was her wish, I wonder if she even did truly finish the maze. Theres a ton we don't know, and many holes in our knowledge that need to be filled. I'm just gonna wait and see if we get proper answers when the mc does.
On Ch 70, and I've spotted a few things that weren't consistent. Nothing big tho, just some minor things i noticed.
1- in ch 1, a man almost goes crazy because when he returned to earth, he finds out its destroyed by monsters. But in the later chapters, it shows that all players returned to earth at the same time for a few days, so he should have already known that monsters already took over earth.
2 - Early chapters, he talks about the skills "leap" and "great leap". I just find it funny that there is also a magic spell called "air leap" -- I mean, how many leaps are there? lol
Anyway, I'm enjoying it but I guess the story gets a little repetitive for me. I get it, its all about learning skills and people getting shocked at his skills. But everything is just getting so predictable now.