Let me clear up the confusion. The saiyan ritual needs 5 saiyans to embue their power into one saiyan giving that aforementioned one the red God look.
After they lose the red form, if their body retains any god power they have the ability to transform into SSBSS. Vegeta skipped the ritual, that's why he shouldn't have attained the blue form.
Weren't people surprised that he could go Blue at the tournament? Wouldn't they have know by then?
Obviously it's an off-screen development, but the bs meter for Vegeta is off the charts.
Only way vegeta can stay relevant is through cheats...happened in GT, same thing in Super
It happened in Z as well. The power boost he got from becoming a Majin was the sole reason he got to SSJ2
He and Goku were already ss2 during the 7 years of training. Goku was still stronger so he used Babidi to close the gap a little bit. Obviously not much since we find out later he had ss3 in the chamber.