I always took Ulysses' odd way of speaking and theatrics to be a result of his life as a tribal, belonging to a group where their hair was supposed to be full of meaning and stories depending on how they twisted/styled it. There's also the fact that living and serving with the Legion would probably give you a good feeling for the mythical/theatrical part of life what with all their titles and imitations of Ancient Rome. You've also got to keep in mind that Ulysses isn't mentally stable either, he is absolutely obsessed with the Courier. Leaving behind the tapes and markings and the Courier actually finding them is pure coincidence (The Courier tends to be lucky like that...) it's equally as likely that he would never find them, Ulysses is just fucking nuts. I also thought his plan to nuke the wasteland was a nice callback to the Fallout plots of yore (Maybe even a reference to Van Buren?) whereas the actual plot of New Vegas was political in nature, the one in the DLCs had a Big Bad like the Master and the Enclave. Ulysses' actual plan to nuke the wasteland isn't THAT non-sensical, as when you question him on it he says he's not going to actually straight up blow them up, but destroy key locations and roads so they "bleed out" (I realize there's a disconnect from that and what actually happens if you set the launch.). You've got to keep in mind that he's utterly obssessed with the Courier and his loss of the Divide. In his twisted mind, he thinks that firing all these nukes stored under his old home and getting revenge on the random mailman that he blames for it (It obviously isn't actually your fault. He just can't cope with the situation so he blames you) will somehow bring back the Divide. Return what was lost. Obviously it doesn't make any sense but the guy is just lost in the head. His life before the Divide was pretty nomadic and obviously the loss of his tribe traumatized him. Finding a home in the Divide was obviously incredibly meaningful to him, and having it snatched away just fucking broke him.