I don't see 2 types of rope, I do see a line that has an eye splice and a hole splice in the middle of the rope and wear on the central portion where the block goes. The darker line coming from the traveler is probably for his water bottle.
Basically this person put a 2:1 purchase system in it, not sure if it is really necessary.
Not sure where you see 2 pieces of rope. there is ONE rope: at one end is an eye splice (left side) then the rope goes through the fairleads as it comes up on the right side there is a hole which you make with a Fid and pass the end of the rope through it to secure the hole. Then the rope goes through the eyesplice (can't see that as it is blocked by the return rope) and then back through the hole and then through the cleat.
Unless there is a rule saying that you can't use any purchase or splice eyes in it then what this person did was a neater way of attaching without knots