Because they are two of the few champions that can actually reach range champions. Without Lee sin, jarvan, rengar, or Reksai (panth? Nautilus? Khazix before all the nerfs) no other jungler is reaching an ADC or ranged characters, especially with the overbuffed CC from supports nowadays.
Do not have gap closers: 
Have gap closers: 
Have Stealth (as good as a gap closer): 
...you sure this is a problem, m8?
Udyr, Eve, Shaco, Fiddle, Diana, Elise, Nautilus, Nocturne, Shyvana, Zac. All not Viable currently.
Amumu, Jax, Xin are good, but too situational given the amount of ranged characters that are domination right now.
How can fiddle not be viable when he makes it top 5 as far as top tier junglers right now? I have have seen plenty of the junglers you are mentioning used just fine
And ranged characters havent exactly changed recently so what is causing this so called issue with ranged?
