Until last summer I was still resentful of how Lallana (allegedly) left the club. It was the only one of 2 transfers that annoyed me. VVD can still rot in hell.
However, as I said, last summer after relegation I actually thought Lallana could be a left field appointment. To me it felt an opportunity for both.
So for him to return now, with what seems a dual role, actually still makes a lot of sense. You can't put a price on experience and intelligence (he is very highly rated already and is well regarded within the FA).
It's a no brainer for me. But, it's just my opinion.