ya I don't see it, so one author's run on one character is not going to touch on a characters past bisexuality. Every comic book writer focuses on the parts of there character that they like to explore. Some people who write wolverine want to focus on his fractured past and lost loves, others on his animal like savagery or his relationship with other X-men focusing on one dose not remove the other as a factor it just makes the current run not attentive to one part of there past.
Marvel has been introducing LGBT hero's more so than most other media just earlier this year in the new series Angela: asgard's assassin they introduced her transgender lover Sera, and recently they have regularly explored Loki's relationship with his/her own gender shifting back and forth as well as others like Odin commenting on his daughter/son.
Marvel will shift its focus on characters back and forth some times characters like Caroline Dean, Wiccan, or Ms America will be heavily featured, or some characters past or present lover will be of a less than cis/hetero/same species variety. Other times they deal more with those cis/het/human characters.
In short comics regularly kill characters, bring them back to life, have them fall in love, break up and deal with gender swapped clones from alternate realities and the only true constant is the next time you read a issue it could change.
Serena