Review עמק ברכה, הגדה אות א or חידושי ר’ חיים פסחים דף קטז which explains there are three aspects unique to the mitzvah of סיפור יציאת מצרים on Seder night.
List a few נפקא מינה between the reason of Tosfos and the reason of Rambam
Is there a connection between these three aspects?
Learn גמרא פסחים דף קטז “אמר רב נחמן לדרו ( עבדיה (before the second Mishna)
How did this exempt them from saying the mah nishtana?
See ברכת אברהם
https://hebrewbooks.org/pdfpager.aspx?req=47539&st=&pgnum=192&hilite=
Learn מהר”ל גבורות ה’ פרק א
https://hebrewbooks.org/pdfpager.aspx?req=3889&st=&pgnum=14
Learn הגדה גר”א explanation on הא לחמא עניא
https://hebrewbooks.org/pdfpager.aspx?req=10674&st=&pgnum=8
What is the connection of the Mitzvos on Seder night to the concept the mitzvah of Maggid?