Headscratchers / The Guardians of Time Trilogy

• Why does everyone have a hard time accepting Rochelle, but have no problems with accepting Dillon? They both used to work for the enemy, after all.
• Marduke would likely know the identities of some of the Guardians. The fact that Carter is his brother reinforces this fact. So why doesn't he just tell Lathenia so they can annhilate the Guardians faster?