Could you elaborate? What are these coincidences and what is remarkable about them? And please don't say "read the emails!" or "watch David Seaman!" like the others.
You read JP's emails for political reasons, you find known paedo / child trafficing jargon in them (Cheese Pizza is Child Porn, various flavours of food describe children etc.). So you dig a bit deeper and then you look at this photo [1] where they look very similar to the police wanted images of Madeline McCann. Wow that's weird.
So you look at his email and find that at the time of the abduction, JP is out of the country and someone else is replying to his emails for him, something that doesn't happen regularly.
And then you find he is friends with suspected paedophile Clement Freud, who lives 1/3 of a mile from where the McCanns were staying. [2] And that they knew each other.
[1] http://www.thedailysheeple.com/wp-content/uploads/2016/11/20...
[2] http://victuruslibertas.com/2016/11/do-john-and-tony-podesta...
Jumping to the most damaging, the second article you link says "One of our FBI insiders can confirmed the Intelligence community indicates John and Tony Podesta were in Praia da Luz, Portugal on May 3rd 2007– the day Madaline McCann vanished. The Podesta brothers were staying with a friend named “Clem”."
So far as I can tell, other than this assertion, there has been no evidence uncovered that the either Podesta brother was in Portugal at the time of the girl's disappearance. You reduce the article's claim that "they were staying a friend named "Clem" to saying only that they knew each other, but I haven't seen any proof of even this level of association.
As 'nindalf' asks, how do you balance the goal of finding the truth with the responsibility to avoid terrible damage to a innocent person's reputation based on something that (at this point) is based largely on trusting an unaccountable anonymous source?
It might not be convincing and certainly not conclusive but there are a series of remarkable coincidences.