Current Super Featherweight champs need to fight eachother

Humberto Soto - WBC Juan Carlos Salgado - WBA Robert Guerrero - IBF Roman Martinez - WBO Four different champs with loads of potential for great boxing matches. Why are these 4 not fighting each other or unifying?? I think these 4 could produce some great fights between them. Soto has been there for a while and is the king (though i think he's about to move up to Lightweight), Juan Carlos Salgado is coming off a huge 1st round knockout of the highly regarded Jorge Linares, can't say i've really watched Guerrero but he's been there for a while and he's defended his title a load of times, only loss is by a SD. Roman Martinez is undefeated, KO'ed Nicky Cook to get his WBO title and has defended it once already with another KO in the 9th round. Anyways, they aren't the best fighters ever but 130 needs to sort itself out and start making these fights because they would be exciting. Super Featherweight has always been quite an exciting division and at the moment it's fairly irrelevant due to lack of big fights.