Built as a warship or hired?

The entire question about which ships were built as warships and which were armed merchant ships that were hired seems to be pretty complicated. There is the document from the Wrangel Collection that lists ships as being hired that other sources say had been built as warships. There are other sources, such as the list of ships in Hendrick de Raedt's pamphlet. That list indicates that Dirck Juynbol's ship, the Gelderland (30 guns) was built as a warship. There are ships specifically listed as being part of the 100 ships of the Extraordinary Equipage:

R=Rotterdam
A=Amsterdam
Z=Zeeland
Adm Ship           Guns Crew Commander
R   Roskam           26 105  Corstiaen Eldertszoon
R   Maria            26 110  Crijn van der Kerckhoff
R   Prins te Paard   38 120  Corstiaen Corstiaenszoon
A   Hoop             28  90  Joris Collerij
A   Keyser           24  80  Jan ter Stegen
Z   a ship           28 100  Lambert Bartelszoon
Z  a fast storeship  20 100  Johannes Michielszoon
Z   Meermin          34*120* Jacob Wolfertszoon
Z   a ship           26* 90* Daniel Cornelisz Brackman
Z   Gecroonde Liefde 24  90* Dingeman Cats

We have thought that the Roskam was built as a warship, circa 1639, but cannot be sure. The Meermin and Gecroonde Liefde were also almost certainly built as warships, as well. We need to see if there is any explanation about why this would be the case, as well as with the Campen and other ships from the Wrangel Collection list that are said to be hired. There are other ships in the Hendrick de Raedt list that were almost certainly hired, but the list is silent on the subject (such as the Roode Leeuw, 24 guns, the ship of Reynst Cornelisz Sevenhuysen).