GELYF, GELYY (the new ADR) and 0175.HK will all track each other.
Most US institutions will not touch a OTCBB stock because of the volatility and risk, but they will buy an ADR due to the price stability and liquidity.
Once US institutions begin to buy the ADR in large blocks, GELYF will also rise to match the % increase equivalent of the ADR.
This is how BYDDF (BYD company that Warren Buffet owns 10%) was able to go from $2 to $10 dollars in a year gaining Buffet a $1 Billion paper profit. The ADR made it possible for Institutions to invest.
A great article to better understand ADR's and how individual investors and institutions benefit: