Will have to check the cricinfo stats, but think he is much better suited to an Astle type role at 5.
Just on this...last 2 years Jan 2011-Dec 2012, his average is 30.92 (Down from his career of 34.63)
Position wise averages (Innings in Brackets), Batting #1: 31.50 (6), #2: 40.88 (19), #5: 26.00 (9), #7: 40.23 (46). As a side note, his average under Taylor is 29.54.
Maybe the telling factor is in 25 Innings opening he has 5 50s & 1 100s, batting at 7 for 46 innings he has 7 50s & 5 100s...