There are also a lot of answers.
The McCanns refused to provide any assistance at all to the PJ from the first hour.
The McCanns only handed over their cell phones after they had wiped the registers, the PJ could not get hold of the records.
The McCanns allegedly travelled all the way to Portugal and all over Europe and the rest of the world over the years without owning or using one single credit card (this is the most unbelievable claim of all IMO

).
As we all know, highly unlikely but no financial records were ever provided so the PJ could not check their movements.
Most of your questions can be answered on this site, also has a google search function too so it's really easy to use.
http://www.mccannfiles.com/index.html