You can make a agrument that Lansing would have a tougher go in 4a, but you can't discount they have a good team and they are due to get better and the Fr, So's become Jr's and Sr's. The majority of their gains were made by a great group guys getting older and better.
You can't compare year to year. Swayz's comment about Bonner dropping 20 spots or so going from 5a-4a has the same flaws. They lost Middleton and other points. They weren't the same team they would have placed lower in 5a as well.
As kids are different and guys graduate you can't compare a team from one year to the same team the following year. Unless like Lansing this year they have everybody back. But even then competition graduates, etc, etc.
You can beat the argument to death that 4a is tougher than 5a. I would generally agree with you, but give Lansing some credit. They have a badass team.
Just my thoughts,
24/7