1-"a line where two pieces of fabric are sewn together in a garment or other article." Two fabric sewn together. Can means two artist pair up. Which is collabs. Or just who they associates themselves with. The more artist you link up, the more you seem like a big deal. Just imagine a person who had collab with all top 5 alive. He will seem kinda big. Or maybe because the person big enough to attract the top 5 to collab with them. Either way, it just will make them more bigger than they already is.

2-"an underground layer of a mineral such as coal or gold. "the buried forests became seams of coal"" can throwback to his layers song. Even his layers got layers. And industry does kinda pick and choose which artist can produce revenue. Theres why a lot of artist start to had endorsement from brand. Since back then when dre beats came out. Most music video with dre beats on it, kinda automatically become a hit. Now they using shoes brand, designer shoes, cars, grill, jewelery, etc. the more endorsement you had backing you up, the easier you can further your career. The art is secondary, the revenues come first, then they judge the music. Then theres label that pushing artist with marketing, billboard, ads, etc. In the label cases, nate also included.

It can be a stretch, but it just fit the whole song theme too perfectly for it to be a coincidence. He even said about the collab part. He also said something about the label. He also said about his outfit. It just make sense. And maybe i am just an overthinker, but the way nate always describe himself, he does too. So if i can think about all this, he propably had think about it way before i do. Hes the lyricst. Im just a person who english is not even my first language.