Adams and Joosten were useful to Ieyasu because they helped provide money, infrastructure and artillery. Cannon from Liefde, the ship on which they arrived, are credited with supporting him at Sekigahara. Trade income is also linked with obtaining support from factions involved in the fighting. Persuading opponents to change sides could strengthen his position before a battle. Their commercial connections thus form part of the explanation for their political value.
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Cannon, trade income and Ieyasu's military position
Artillery and trade income help explain Adams and Joosten's value to Ieyasu.