I read through this presentation and could not find anything that I disagreed with. But this is going to be a hard sell to most people. There are some books out there that help lead us through this fickle path of dispensation and doctrine. I personally recommend :

http://www.rightlydivided.com/content/chapter-1-section-i-of-ii.htm

I am currently re-reading above book for third time...this right division of the bible is something that has to be refreshed and maintained to keep an even keel of biblical perspective for a healthy daily walk. Failure to do so will be a snare and a detour of self condemnation and misplaced efforts.

http://www.kenblueministries.com/category/books/dispensation/

Ken Blue is probably the  most intelligent and accurate expert on rightly dividing the scriptures.

Hope to have been of help, and I appreciated the boldness and honesty Mercer presented here.

Alan T