In fact 1st, 4th, 6 & 7 photos 'really' shows us, that the tail colour of Alsirhan's bird is not same as in the rump (thus a different colour). Colour does not differ so much between tail and rump in Marsh Warblers.
Alsirhan's bird - summary (# photo number):
Hippolais, because
- very broad bill (The broadness of the bill base) #4, (8)
- mouth yellow of Olivaceous #4
- lower mandible + yellow colour looks like a 'straw stick'
(MW > pale, but at most yellowish) #6, 7, 8
- very pale tertial edges (a hint of a hippolais secondary panel) #2,3,5,7,8
- slightly shorter inner tail feathers than outer tail feathers #4,6
- outer tail feather does appear paler in one of the pics #4
- dark colour of tail #1,2,4,6,7
- greyer upperpart
- The 7 primaries exposed beyond the tertials #2,3,5,8 (variate at least 6-7)
(Marsh W mainly 9, sometimes 8, depending from the wearing of tertials or something else, but this feature is not absolute. When MW has 9 primaries exposed beyond the tertials and tertials overdrawed secondaries, it often means that distance between innermost primary feather and outermost secondary feather is more bigger than lenght of tertials owerdrawing)
- quite dark eye #1,2,3,5,6,7,8
(- the peaked crown # 1,2,3,5,7 (8), this feature should be connect with bird's behaviour (it must study in the field in which situation bird bristle head feathers and on that way we can truly say, does it clear specific species 'ritual' ) )
Svensson has written from EOW in his book:
"Pale sandy-brown above... the rump is tinged ochrous. The underparts are on average more cream-coloured than in Western..." and elsewhere: "..greyer upperparts which are slightly tinged olive when fresh."
So Alsirhan, do you have any comment ?