The reason why Chinese team are so weak in G1 is because LOL in China.
Please see the rankings
Statistics: 113-37 (75%)
Statistics: 235-60 (80%)
Statistics: 55-18 (75%)
Statistics: 49-17 (74%)
The number of the matches IG and LGD taked is less than half of NAVI and AL taked.
Why? because ACE(Association of China E-sports), which is founded by Chinese dotaers but now is controlled by LOLers.
The ACE do not allow Chinese teams(IG,LGD,DK) to attend small matches(less than 250,000RMB=40,000Dollars).
So, there are only three matches(G,G1,DSL) in China IG,DK and lGD can attend in 6 months.
So few matches, how can you expect their performance?
Their draft style is so old and the players don't know how to play a real game.
ACE only focus on LOL and give it a lot of games every week, however, dota2 is ignored by ACE.
The leader of ACE is from WE, a club now do not have a DOTA2 team.
In ACE's weibo(like facebook), you cannot find any news about DOTA2, only LOL.