It makes sense, since Majuub most likely in 5 months has strengthened a good amount until Arc Super # 17. I have Majuub (Super # 17) on SBV2.
Everything indicates that Vegeta transforms into SSJ2 at the end of Arc Super # 17, therefore Vegeta SSJ (S17)> Majuub (S17).
Also, Goku SSJ (S17) was confident of defeating Super # 17, despite seeing him easily defeat Vegeta SSJ2 (S17).
Later, Goku Base rivals Si Xing Long Base. Goku states that Si Xing Long is much more powerful than the previous Dragons, including Wu Xing Long Giant Form and Qi Xing Long (with absorbed Pan), which means that Goku Base (Arc Si Xing Long) surpasses the first 4 Dragons.