Owners are discounting Thames based on the results of Park and of course validating Thames based on results of Kang.
Both Park and Kang also had the distraction of adjusting to a different culture and also both were adjusting to major league pitchers for the first time. Thames has prior major league experience and has no assimilation issues.
The fact that Park was DFAed by Minnesota is also seen by fantasy owners as a sign that Park was a failed experiment. Minnesota's DFAing of Parks was probably a calculated gamble. Given Park's lack of success, the uncertainly of his recovery from wrist surgery, and his contract, Minnesota gambled that no one would pick him up and in fact no one did, and Park remains with Minnesota. It is very possible that we have not seen the last of Park. His inability to make sufficient contact could be attributed to Park's inability to adjust to a new culture, pressing to live up to his contract, lack of confidence playing at the MLB level, and/or playing through wrist pain before succumbing to wrist surgery. If any or all of these were factors, then the comps to Thames are irrelevant. One a side note Park could be a sneaky waiver pick up.