I wouldn't say that. Never been a massive fan of Allen and there's plenty who have a long enough memory to know he has a handful of good performances in a season along his nightmare games and the invisible man impressions (the majority).
As for Hendo, I've always been a supporter of his, from the day he joined to be honest, but he's not a captain. He's a limited player and not someone who should be automatic first choice in midfield either. What we saw today was the Henderson we've seen most of the season. He'll run all day and excel in the right game but if there's no space he has no ability to make it, and if the other team press our midfield he can't do anything with the ball.
For me Henderson is the ideal midfield partner to an Alonso. Someone to do the running and the hassling, buy he can't dictate a game. Nor can Allen for that matter.
I think we've seen signs that Henderson can dictate a game, Allen as well for that matter.
Dictating a game (imo) isn't necessarily getting on the ball, spraying passes long passes around Like xabi did (Imo masch dictated games more than Alonso for us, he stopped the opposition playing there game, and we ended up playing ours more often than not as a result) It can be harrassing the opposition into mistakes, quick incisive passes around the opposition through making yourself available and running through the lines.
I personally next season would be confident of a midfield three of can - hendo and either sterling or coutinho further forward (Dependent on opposition).
In terms of having an alonso type player, I don't think it would make any difference in this system, they'd be limited by movement we can do with the players we have. Ibe excluded none of our players like running beyond their man for the most part. The player I'd love to have would be verratti, midfield of him, hendo/can and sterling would be unbelievable