Well Danny Ings doesn't play for us so it's not that surprising that there's less chatter about him on an Everton forum, but actually the chatter that there is is almost exclusively people saying exactly what you're saying they're not. Just ask poor foreverblue, who has advocated signing him and had a barrage of people laughing at him because he's a one season wonder.
I feel like you're still not getting the point but I genuinely don't know how I can make it any clearer. Scoring in gluts isn't being used as evidence that he can't do it long term. I've literally just explained that to you. If he'd scored 15 goals in 3 consecutive seasons but got them all in gluts it would be fine, you'd still say he was likely to get 15 the next season. But he hasn't, he has only scored in ONE glut. It's like us still saying that Jelavic and Andy Johnson were 30 goal a season strikers. They weren't. They were players who had short bursts of exceptional form but couldn't keep it up long term. It is possible that DCL will be another, there isn't sufficient evidence for us to know that he can be relied upon for 15 goals next season. It's really that simple.
I think the key difference is Johnson and Jelavic have retired so we can view their whole career. Calvert Lewin is 23 and on an upward trajectory. We are speculating as to what he can do next season, but it's more likely than not he can maintain his performance level if you look at the evidence objectively, isnt it?
Then there is us... We have 2.5 months before the madness....