what drove me absolutely insane was after 1970PT everyone suddenly acted like Quentin was an ordinary member of the family who had always been around. it was very sloppy writing/continuity.
The character became so popular that it was a given that they were going to hold him. But when they brought Quentin into the present, they clearly had no idea what to do with him. After he regains his memory and Amanda Harris is disposed of, Quentin functions more as a plot device than a character.The [spoiler]Daphne fixation in 1970 [/spoiler]might have played out better if that had been Roger instead of Quentin. The 1897 Quentin was shown to be well versed in the occult and should not have been so easily ensnared.
Prior to the amnesia, Quentin should have retained his memories of Barnabas and Julia being from 1969. Yet it is not them that he chooses to make contact with.