Based on the provided reference, it's difficult to definitively name the weakest Saiyan, as the list focuses on relatively stronger characters and doesn't explicitly rank the absolute weakest. However, we can analyze the characters mentioned to understand which ones might be considered weaker compared to others. The reference mentions figures like Gogeta Blue, Super Saiyan Rage Future Trunks, and Gohan Beast, alongside Super Saiyan Rose Goku, Vegeta Super Saiyan 2, and Super Saiyan 4 Goku. These characters are generally considered among the most powerful, not the weakest.
The provided link focuses on a list of 10 weakest Saiyans, but the actual names of the weakest Saiyans in that list aren't included in the provided reference text. Thus, a definitive answer about the single weakest Saiyan cannot be directly determined.
Therefore, while we can compare the relative power levels of characters like Super Saiyan 2 Vegeta versus Super Saiyan 4 Goku using the reference, we lack the information needed to identify the absolute weakest. We can state that the provided characters aren't amongst the weakest, for example, it is unlikely Super Saiyan 4 Goku would ever be considered one of the weakest Saiyans as he is one of the strongest variations.
It's clear the provided reference material does not list a definitive weakest Saiyan, instead, the link leads to a list of the ten weakest. As we lack the names of the ten weakest, we cannot determine the weakest from the text.