It makes perfect sense in the same way TLoZ's timeline does - Kojima is a master of retcons and introducing "plot convenience bulls*it" to push the story forward. I've played every MG game from cover to cover, excluding the spin-offs like Ac!d, and the plot barely sticks together. For starters, in Phantom Pain Kaz Miller becomes infertile and yet somehow by the time of Metal Gear 2 *he has a daughter*. Let's also not forget that *he's blind and missing an arm and a leg* while in Metal Gear 2 he's magically healed and looks nothing like himself. It's also convenient that the government hired him as a codec consultant, seeing that they practically considered him a terrorist last I checked and attempted to assassinate him. After that, in MGS, "Master Miller" is supposed to be retired and spends his time training soldiers at boot camp, it's implied that he also trained Solid Snake at some point. If Solid Snake was so familiar with him, he would probably know that Miller is disabled and would have to be a complete imbecil not to see through Liquid's deception. He also tends to change his name or add new nicknames to his already impressive list of callsigns at the drop of a hat, possibly depending on Kojima's mood. We should address him by his full name - Benedict "Kaz" "Kazuhira" McDonnel "Hell Miller" "Master Miller" Miller. With a name like that he could be a Nigerian prince. Maybe it's just different Millers, it must be a coincidence, I'm sure there's 30 different Millers working in the same department at Spy Central, no relation. That'd certainly explain why he doesn't age - it's either different people or he's a vampire - not too farfetched, seeing that the series already features a bona fide vampire anyways, because why not. Then there's Big Boss - the guy the the U.S. wants dead who'd been laying low throughout V in case Cipher wanted to assassinate him (hence the Venom Snake "trick") ends up *getting hired by the government* to retake command over FOXHOUND (which he supposedly started with the help of the U.S ARMY sometime post-MSF. Why would they help him despite the events of Peace Walker and the open antagonism between him, the CIA and Cipher? Where do the Diamond Dogs fit in this mess? Does it matter?) and *everyone is surprised* that he's a double agent during Operation Intrude in Outer Heaven. Or maybe he doesn't - maybe it was Venom, who knows with Kojima, but I distinctly remember him having both arms. In MGS 2 Ocelot's mind is "taken over" by Liquid's arm just so that in Metal Gear Solid IV he can say "lol, I was just trolling, I actually brainwashed myself". Sure you did. Technology progression makes no sense either - in Peace Walker, Gears have advanced artificial intelligence - then for no reason they don't anymore - before MGS IV they required a pilot or remote control, featuring only minimal autonomous functionality. Let's not forget that the Sahalantropus and ZEKE are superior to REX and the original Metal Gear in every way which makes no sense - there's no reason why anyone would make a Gear worse than the ones that were already made. In fact, in MG everyone's acting like Metal Gears are these new unique weapons that were never seen before when in actuality they've been around since the Cold War. Kojima has written himself into a corner so many times it's not even funny, he writes scripts willy-nilly. There are many inconsistencies in the series and whenever they come up, Kojima just conjures some coincidence to make it stick. If it doesn't work, insert nanomachines, Decoy Octopus or a superpower of some kind. Not that I'm terribly bothered, the games are loads of fun, but let's not make a Tolkien out of the man.