Only Yorick plays PENTAKILL while the others do their default.

Alright folks, so I played the PENTAKILL Yorick and I loved hearing Lightbringer. However that got me thinking, why do the other PENTAKILL members not perform as well, whether its the same Lightbringer (synchronize) or another song pertaining to them (Sona-Orb of WInter, Olaf-Thornmail, Karthus-Deathfire Grasp, Mord-The Prophecy although not a song but it is the only one that has some essence of him). I feel as tho riot is missing out on making the other members just as amazing as yorick with the instrumental soundtrack. Now I can understand if its some legal reason ok. "It would take time" of course it would, but the effort will be appreciated, and hey, it could drive people to buy the skins if they dont already have it. "We just dont care" alright then.