Another unidentified "Tyrannulet" from Aguas Calientes, Peru

[rwilson5]

Forktail commented in my previous thread that there were many confusing tyrannulets at Aguas Calientes. Well here's another one...
Maybe a Mottle-cheeked Tyrannulet?
Unfortunately this is the only photo I got of this individual and it is not the most helpful of poses, but maybe someone has some ideas.

Ray
www.raywilsonbirdphotography.co.uk

[coeligena]

You're right, this is not an easy pose! Mottle-cheeked Tyrannulet is a very slender-looking bird, which tends to have a more horizontal stance and often an upturned tail, so I'm wondering if this isn't something else, Sclater's Tyrannulet perhaps? I'm not sure though.

[Joe Tobias]

Sclater's Tyrannulet can be ruled out because it has an all-dark bill. The angle is not good, but I think you're right that this is a Mottle-cheeked Tyrannulet.

At first I thought you meant Aguas Calientes near Abra Patricia, where other tyrannulets can cause confusion, but there are not too many look-alikes near Machu Picchu.