Gaby seconding on Cerro de la Cruz

Gaby seconding the first pitch on an ascent of the Laja de Peterek (5.10c/d). To do this route, start with the first two standard pitches on Cerro de la Cruz (each about 5.9). Then comes the roller coster pitch of the Laja (too much fun). Finish via a 5.10a face pitch going up and right (the straight up version of the face is around 5.11a). After that scramble to the top by easy 5th class climbing and walk down (although rappeling is also possible). This makes for a 4-star route, so why does Gatito only give it one star in the guide?