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. 
If DT is alive, he's sure 
to rejoin the targets.
Si DT estuviera vivo, seguro 
se reuniría con el objetivo.
Si DT estuviera vivo, se reuniría con ellos.
Se DT estiver vivo, ele vai se
reunir com os alvos, certamente.