Table:
text: 2008–09 West Ham United F.C. season
Matches
FA Premier Reserve League South
Match_ Date_ Competition_or_tour Ground Opponent Score1
1 15 September 2008 FA Premier Reserve League South A Chelsea Reserves 0 - 2
2 30 September 2008 FA Premier Reserve League South H West Bromwich Albion Reserves 4 - 3
3 7 October 2008 FA Premier Reserve League South A Fulham Reserves 1 - 4
4 21 October 2008 FA Premier Reserve League South H Arsenal Reserves 1 - 0
5 3 November 2008 FA Premier Reserve League South A Tottenham Reserves 0 - 2
6 25 November 2008 FA Premier Reserve League South H Portsmouth Reserves 2 - 0

Question: Under 2008–09 West Ham United FC. What bottom had Portsmouth reserves as opponents of FA Premier League South games?

Question: What was the reason for West Ham United FC's 2008/09 season being an FA Premier Reserve League South game less than 6 in 2008/2009 and Chelsea Reserves the opponents?