Smaller byte size Encrypted Pre master secret should be considered?

[subramanya-shetty]

#File Name
TLS_SRP_SHA_RSA_DIFF

#File Description
Cipher Suite: TLS_RSA_WITH_AES_128_CBC_SHA (0x002f)
Contains 1 ENC PMS which is of 1 byte and value 20.

#Observation
Extracted the ENC PMS value properly
But the concern is, whether Enc Pms value of such a smaller size should be considered or not?

#Attachment