Paul, the Resurrection and the empty tomb

Steven T Davies makes a very interesting point about Paul's knowledge of the empty tomb. In his book "Risen Indeed: making sense of the Resurrection" (1993) he writes the following (p76):

"But does Paul implicitly refer to the empty tomb in 1 Corinthians 15:4, where he mentions Jesus's burial? I believe it is quite probable that he does. Paul's own view of the nature of the Resurrection, in my opinion, requires that the tomb be empty (which is the reverse of what is sometimes claimed). This is because his simile of the plant growing from the seed (1 Corinthians 15:35-43) entails material continuity between the one and the other. That is to say, Paul's view would seem to imply that Jesus's body could not still be decomposing in the tomb, because it had been transformed into - it became - Jesus's Resurrection body (just as the seed becomes the plant).24"

 "n24: See also Romans 8:11, in which Paul seems to equate Resurrection with the spirit of giving life to a mortal body."