Crawford vs Indongo is the only fight of the two that will have all 4 major alphabet world titles on the line in full (WBA, WBC, IBF & WBO).
In full means that none of them are interim or secondary world titles (ie., the WBA's "Regular" world title).
Crawford vs Indongo world titles on the line:
WBC (Major world title) - Crawford
WBO (Major world title) - Crawford
The Ring (their version of the Lineal Championship title) - Crawford
WBA (Major world title) - Indongo
IBF (Major world title) - Indongo
IBO (Minor world title) - Indongo
Indongo's WBA world title also carries the "Super" designation. The IBO minor world title isn't required to become "Undisputed". As of 2007, all 4 major alphabet world titles in full are required to truly claim to be the Undisputed Champion (if you believe in collecting all 4 of the alphabet org's titles that is). The winner will be the Lineal & the Undisputed Champion of the world. And, what's even better, the Lineal Championship status will be recognized by
both the TBRB/Transnational Boxing Rankings Board & The Ring. This is already currently the case with Crawford, there's no discrepancy.
Everything falls into place perfectly for this world championship unification fight.
Alvarez vs Golovkin is a world championship unification fight that will have 3 of the 4 major alphabet world titles on the line to be contested for. Since not all 4 major alphabet world titles are on the line then the winner will not come out as the "Undisputed" Champion. Billy Joe Saunders still holds the WBO world title after all. Sad, but true.
Alvarez vs Golovkin world titles on the line:
WBA (Major world title) - Golovkin
WBC (Major world title) - Golovkin
IBF (Major world title) - Golovkin
IBO (Minor world title) - Golovkin
The Ring (their version of the Lineal Championship title) - Alvarez
Golovkin's WBA world title also carries the "Super" designation. Again, the IBO minor world title is not required to become "Undisputed" but I'm listing it because it's also up for grabs. The winner will not be Undisputed Champion of the world thanks to Saunders holding it hostage until recently & Oscar saying that if Golovkin took the fight with Saunders then he wouldn't get the Canelo fight next. Alvarez is recognized by The Ring (his promoter owns this publication/company opening up the door for a conflict of interest) as their Lineal Champion. However, the TBRB (much more reputable) doesn't recognize Canelo as the Middleweight Lineal Champion any longer as of mid April. The Lineal throne is now open with the TBRB's rankings listing Golovkin as #1 & Canelo as their #2 ranked contender. They'll be taking a vote on whether the winner will be recognized as the "true" aka Lineal Champion after the fight. The problem is that it isn't clear that Canelo is the #2 contender to fill the vacancy since Jacobs is ranked #3 (imo Jacobs should be #2).
Some already consider GGG the Lineal Champion after beating Jacobs officially (I scored it for Jacobs) while others still maintain that Canelo is the rightful Lineal Champion despite the TBRB interpreting him stating that he was no longer the champ as vacating. If we just go by The Ring's version of the Lineal Championship then the winner will be the Lineal Champion. The TBRB's Lineal Championship recognition nowadays is the most complete of the two (there's no belt awarded to symbolize it) and as a result the most respected. Their Lineal decision is "TBD" for now regarding the true champion of the division.