Gustave has taken it upon himself to observe Marion and Sanglain following the death of the Princess and DT.   But KT thinks Gustave is in the city of Marquesas for other reasons. 
But you have all the 
more reason? Maybe.
Pero tú tienes más razones 
que antes. Quizás.
Pero tú tienes más razones 
que antes. Quizás.
E você tem outra razão? Talvez.