They didn't try to buy Yekindar. He was playing for Pro100 which is Zeus' org. I'm pretty sure they would find solution with Danya, but they decided to keep Flamie cuz management is obosranniy. They don't wanna change anything cuz can be worse.
Look at Spirit. They had good AWPer Idisbalance, but they decided to take even better one cuz they didn't think "It can be worse", they think "how can we be better"
Meanwhile NaVi management is obosranniy, if team is somewhere near top5 they won't make changes, they will wait team to fall out of top10 and best players of team to waste their prime on tier3 teammates such as Edward and Flamie, and then, probably, they will change something