maybe Methos only had bob occasionally when he showed signs of colour coding, then Caspian would give it to him to play

Methos being sneaky and having gotten used to Bob after having him for a while when Cassandra escaped (Caspian might have been glad that his brothers fake priestess was far far away, he didn't like her... and he wanted to see how long his mark would last) decided to take him to greece when he ledt the horseman

he was going to give him back but then... oops