General grievous

Yes, it thought that would appear shard in a better frequency, but it is looks like the normal shipments, so now I'm changing 20 shards of characters that I have 7 stars to get 2 shards of a character that I need, because in the Arena and Galactic War shipments I have all the characters that I want, I'm farming Eeth Koth and Resistance Pilot but are not a priority, so if appears 2 shards of Rey or Royal Guard,, for example, I will exchange 20 normal shards by 2 shards. Also I'm farming FOTP, that with Rey and RG are the priority in the shards shop.

Get Grievous is for fun, or a reward for the P2P players who wasted a lot of money, but not very useful in the Arena, I prefer get 2 shards of Rey, RG or FOTP when appears.