So yeah, I finally beaten it; 4 months later but I'm finally here.
I don't think he would be with Big Boss on the chopper if he was some no good scrub. He has to be very trusted and skilled.
But to be fair nothing about this game indicates Venom is too skilled or overpowered. He gets a lot of help from Motherbase and his buddies. Nothing about him is as bad ass as some of the stuff Big Boss or Solid Snake had to do in previous entries. He is just a regular guy and you are even able to avoid some of the boss fights in the game. I think Kojima balanced it out fairly. Especially when you consider Venom's ultimate fate.
If that was intentional. Even with all the support, they won't help you if you are incapable of weaving and bobbing lasers, missiles, gun fire, etc. And with the world on the line, relying it's survival on some dude we've never heard of and apparently was some 3rd or more in command for a year gets really wonky. I'm more willing to believe in prehistoric super microorganisms then the fact that, and I think it was only referenced in one sentence, how this shit was even possible was due to coma-based hallucinogenic techniques like it's not that big of a deal. I suppose maybe Big Boss' life indicated that there were forces that somehow made the future (Solid Snake's games) look like shit and behind the times and that the lone person started to become irrelevant compared to how this franchise started but I can imagine being able to just turn one's mind into the Boss' would be the biggest game changer in warfare history, where you don't need a warhorse, just a few dudes and duddetes single-handily dismantling your enemies for you at the fraction of the cost compared to probably all the other options available at the time of this franchise' fiction.
All of this would be the case if you accept that all the support you can throw at is just a symptom of the concept of building an army and not literally an indication that you, the player, just so happen to have the right support to make up for the lack of consecutive, legendary, one-man army skills that would be needed to prevent the world from blowing up.
The point I'm making is Venom doesn't have any special skills or abilities. People keep saying he was transformed into Big Boss while he was in a coma but its not true. Big Boss and Solid Snake have legacies because of what they achieved. Their names are known for Snake Eater, Peacewalker, MG, MG2 and MGS1. Both of those guys are renown super soldiers who made a name for themselves. Venom doesn't have any of that. Like at all. He is just a stepping stone for Solid Snake. He is a failure and a fraud.
Its pretty much the entire point of MGSV. Everything you do in the game is meaningless because it will all be dead or destroyed in the next game. Venom will die and the Outer Heaven you spent hundred of hours building will be destroyed. Its actually genius design by Kojima but he will probably never get credit for staying true to the lore of the series.
What comes down to rather the player can accept him or herself as "Big Boss"/Kojima's
protege/customer/fan or not. It is a rather brilliant thing if this was an original game but since it's a prequel, it can be perceived as simply a desperate attempt to salvage his "world" and that he sacrificed his canon just so he can say #FucKonami.
I'm still in a limbo on rather I can accept this or not...knowing the development troubles and the game's dark themes and uncomfortable elements that seem to reflect that, coming to acknowledge that MGS4 was not the game of the last generation, the fact that so much of the story seem more a stop gap then an actual progression towards Metal Gear...as that Super Bunnyhop video ended...what this game's phantom pain will be is guessing what was intentional and what was not...