the fourth year's player option really impact houston long-term plan ?

i agree with Clutch after reading his article for lowry's trade. But i really can't understand why rockets let dragic go ?!!! why why why

Goran Dragic is pretty good and hv a better finish ability than lowry.
Why rockets give up this guy just about the fourth year's player option ? only 8 million a year difference , come on , dragic deserve it especially when other teams pursue him strongly and lowry probably go. Now phoenix get him with a 4 years 30 million contract (4 million bonus for allstar title) and ours is 3 years 24/25 million, what the **** ?!!! forgive me , but i really don't think it's a big difference , rockets should raise their contract to keep dragic . it disappointed lots of chinese fans .

anybody who can tell me , how the fourth year's player option will impact rockets long-term plan ? what i can think of is morey believe Sergio Llull is better than dragic and he will come to houston next year , so a back-up PG don't derserve a 4 year contract .