It was understandable that most lycans looked down on humans and didn't want to crossbreed. Anne was different from the others. She could see the good in Jack and her love for him had blinded her to the point that she betrayed her own people.
Once Anne and Jack mated, Anne could share her strength with her husband, and that's what made Jack a capable hunter with skills and strength above most humans, but still… it was not enough.
But Leland… he believed he was much stronger than Anne. If he could share his strength with Sophie, it would be enough for her to protect herself when he wasn't around.
However… he couldn't do it if Sophie was not his mate.
And the woman was clear with her feelings. She just lost her husband and didn't want to open her heart for another man.