Data set analysis

What is the difference in feedback between short side comments and one long comment at the end?

Codes: the codes I noticed between comments on the data sets: many of the comments do not point toward specific problems. Also a lot of them focus on what the student is doing well, even if the essay is missing the point of the assignment. The teacher also pointed out things that the student needs to change.
Categories: groups of codes: the questions posed at the end teachers comments are related. Whether its a good comment or a comment asking something to change they have the common strategy to strengthen the essay and move the student towards better grasping the assignment.
Patterns: I noticed many patterns in the teachers comments that kept coming up between the essays. For instance the comments were all one long paragraph at the bottom(as far as I can tell) in these paragraphs the instructor tells the student what works and what doesn't. I noticed that the teacher always follows up bad information with good is vice versa so the student doesn't feel too overwhelmed with bad comments. The instructor always tells them first what they are doing right.

In regards to teachers comments from my own personal experience I get better feedback from side comments, that way I know exactly what isn't working and can fix it or take it out. When a teacher writes a paragraph at the bottom of the page it makes me feel like no revision is necessary. Depending on what they say, usually they say something unspecific like "some points made seemed to get lost" or something specific like "add a theorist to strengthen your argument" the specifics make sense in a long comment but the unspecifics are lost in the length of the essay and the teachers end comment.
In data set 4 most of them, as far as I can tell, only have a comment on the bottom. For example in #4 the teacher instructs the student to "condense and expand at the same" if I got that written on my paper I wouldn't know what to cut out and what to expand on. When comments are on the side saying this doesn't work or move this to the beginning it makes revising much more tolerable because you know what to change. However perhaps the point is to not give the student the correct procedure and instead force them to figure it out themselves, that is, work out for themselves what it is in their essay which works and what doesn't work.