Yeah sure why not

Everyones favourite Pipe! well honestly favourite Pipess don't come up much in my conversations because I don't vape lol but I assume Mr. Pipe is infact everyones favourite.

So in Mario & Luigi: Partners in Time Professor Elvin Gadd invents a Time Machine, and uses the Cobalt Star to power it. In this he effectively introduces time travel to the Mario World. But another interesting thing is we learn how time travel works in the Mario World from this, and effectively how the Mario Timeline works.

So there is a part where a past E. Gadd sees Baby Mario and Luigi trying to put out a Thwomp with water. This causes his present self to gain new memories, and gets the idea to create the Hydrogush 4000 and help out his past self. This is establishes time travel instead of creating a branching timeline merely alters the past, and by extension the present. In addition, this would mean the Mario timeline doesn't split but remains as one continuous timeline.

This is further backed up by the events of Super Mario Galaxy where the universe resets, and things are just a bit different. This is seen in the Star Festival and events of SMG technically never happened. And outside of that the timeline remains the same and there is no splitting.

This also explains why Kamek in Partner's In Time says he remembers kidnapping the Baby Bros. once, when he has at least 2 times. It's because this is the first time anyone has time traveled and altered the past. Meanwhile games like Yoshi's Island DS and Yoshi's New Island involve time traveling and active meddling in the past thus altering the past, making it where the events of Super Mario World 2 Yoshi's Island is not the only time Kamek has kidnapped the Baby Bros. This also explains why Mario is using the alias and disguise Mr. Pipe, he is trying to avoid meddling with the past too much while Bowser doesn't care at all.

This also lines up with what Miyamoto said it's always the same Mario across games. He said this in response to a question about if it was the same Mario in comparison to Link being a different Link in each game via timeline split and reincarnation. While the Zelda Timeline Splits, the Mario Timeline does not. This also means the Zelda games cannot take place on the Mario World let alone in the Mario Timeline. Written by Eris the Lorekeeper

18. Talking to a bird

“Mr. Pipe is so weird. He doesn’t talk at all, only writes stuff in that book of his. He follows me around the town and writes. I don’t know what he writes about, but I’m pretty sure he wrote stuff about me once. No one else can see him, or maybe he’s less noticeable? That’s weird because he’s a giant bird!”