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What's the Difference?

The May 2010 Master Solvers' Club poses this problem:

Matchpoints, neither side vulnerable

South
KJ103
K
AKJ1065
A3
W
N
E
S
1
4
X
P
?

One issue that was raised by Bart Bramley's discussion of the problem was the difference between a direct 5 and 5 followed by 5 ("delayed 5"). I'm not enumerating every possible option below, so if your choice is missing, sorry about that.

In your view, what is the difference between the two sequences? 

Direct 5 is nonforcing; delayed 5 is forcing. Both may have only four spades.
Direct 5 is nonforcing; delayed 5 is forcing. Both show five spades.
Direct 5 is nonforcing but shows five spades. Delayed 5 is forcing but may have only four spades.
Direct 5 shows five spades; delayed 5 shows exactly four. Both are nonforcing.
Direct 5 shows five spades; delayed 5 shows exactly four. Both are forcing.
The difference is in diamond, not spade, length shown. Both are nonforcing.
The difference is in diamond, not spade, length shown. Both are forcing.
Something else.
Direct 5 demands slam opposite club control. Delayed 5 shows a club control and is nonforcing.
Direct 5 invites slam opposite club control. Delayed 5 shows a club control and is nonforcing.
Direct 5 demands slam opposite club control. Delayed 5 shows a club control and is forcing.
Direct 5 invites slam opposite club control. Delayed 5 shows a club control and is forcing.

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