I am sort of getting used to Alesha's role on the show (even if I cannot say I am that thrilled with it), I she is a speak from the heart person, and I think that is the way she is trying to help. I am trying therefore not to think of her in terms of her being in Arlene's place.
Having said that, when Alesha told Lynda she did not need to be a 5'10'' stick insect to be great, I was reminded of Arlene's similar comments to Letitia, who like Lynda suffered from negative body image issues. Arlene told her she was beautiful, and wanted to give her confidence. I know it is unfashionable to to remember Arlene as being nice, but I do remember those sort of comments from her. If Alesha works on the celebs' confidence then this may be her niche.