SB's description is different to the others, it doesn't even resemble RM at all. The hair colour is completely wrong. The glasses lens colour is completely wrong. And no mention by her of the man she saw doing any translating. The man she refers to is clearly IMO an MW tourist involved in the very early searches immediately after the alarm keen to help find the child.
The different man, referred to by DP ROB RO and FP as translating that night before SB arrived, is IMO probably a long term expat, but definitely not RM. Many long-term expats do learn portuguese BTW. And having shortish dark hair and wearing glasses are nothing unusual.
Yes, the important point is that SB did not state she witnessed her man translating and she was told by someone else that it was RM.
http://www.mccannpjfiles.co.uk/PJ/SILVIA_BATISTA.htm*snipped*
She remembers, although she is not absolutely certain, given the time already elapsed, that an individual of about 1,70m, short light brown hair, with thin framed and light brown glasses, wanted from the start to help finding the child Madeleine McCann.
She doesn't remember at what time she saw him.
She doesn't remember how he was dressed up.
She doesn't remember who was with him, whether he came walking or in some vehicle. That same individual, she was told later, is the son of Morat, his first name is ROBERT.
..........
She states that she spoke for the first time with Robert on Saturday (05-05-2007) or Sunday (06-05-2007) or may be on Monday (07-05-2007), during the breaks between the interviews in which he participated as a translator.