She-Hulk's Connection To Daredevil Sets Up The Easiest Avengers 5 Debut
While She-Hulk: Attorney At Law's reveal of She-Hulk and Daredevil's romantic connection was played for laughs, it also provided the universe with an easy way to bring Daredevil into Avengers 5. Though Jennifer Walters and Matt Murdock aren't depicted as being in a strictly serious relationship, it's clear they have a positive connection built on trust.
She-Hulk is a prime candidate for Avengers 5's hero roster due to her high-profile nature in-universe and her ties to Hulk. Since Avengers: The Kang Dynasty seems set to bring a colossal threat to the Mcu's doorstep, it's likely that any and all heroes available will be called upon, especially if this lets a bigger group then go on into the plot of Avengers 6. With all this in mind, such a colossal catastrophe would warrant She-hulk calling Daredevil up to join the fray, and it's unlikely Daredevil would say no if the universe or multiverse was at stake.
Why She-Hulk Bringing Daredevil Into Avengers 5 Makes The Most Sense
With only Daredevil and Punisher having been concretely confirmed in terms of Netflix Marvel heroes returning in the Mcu, the connections that Murdock has in the community are more limited. Daredevil did help Spider-Man with his legal battles in Spider-Man: No Way Home, but Peter Parker never learned of Murdock's secret identity, and the lawyer presumably has forgotten that Parker and his hero persona are one and the same. Daredevil has also interacted with Echo, but it's unlikely the pair would know how to contact one another, and perhaps less likely that Maya Lopez is on the Avengers' recruit list.
Given this lineup, She-hulk is currently Daredevil's main tie to the MCU's focal heroes, and thus the most viable way for him to be brought into the fold in Avengers 5. This is compounded by the fact that Jennifer Walters knows Matt Murdock's hero and civilian identities, meaning that even if Daredevil does end up working with new heroes in Daredevil: Born Again, She-Hulk may still have the most pressing link to him.
Why Daredevil Needs To Be In The Multiverse Saga's Avengers Movies
Discussions surrounding how Daredevil could appear in the Avengers movies are pressing matters for audiences because of the importance the Marvel hero has both in the comic lore, and in the MCU specifically. Daredevil has been a cornerstone of the comics for decades, and his consistent popularity is arguably comparable with the likes of Iron Man or Captain America, meaning that it seems natural for him to be a central figure now he's been reintroduced on-screen, even if he's a generally more grounded hero.
On a similar note, the MCU is at a place where it needs big-name heroes to take over from the characters whose stories ended in the Infinity Saga. While the franchise has plenty to draw from, Daredevil's history in the Netflix series and steady build-up make him one of the more exciting prospects to choose from. As such, having the hero feature in Avengers 5 and Avengers 6 seems the wisest move for the MCU, even if the current most straightforward way to bring him into it is perhaps a little unconventional.