JR Pass or Not - KINUGAWA ONSEN

Hi, Travel with family of 4 Please check my itinerary to see JR PASS make sense?

Day1 Tue
Shin-Osaka 大阪 -> Hiroshima広島 光速號：Hikari

Day2
Hiroshima広島-> Tokyo東京 光速號：Hikari

Day3*
淺草站(ASAKUSA) —>鬼怒川溫泉站(KINUGAWA ONSEN)KINUGAWA THEME PARK PASS by TOBU RAIL KINU105

Day4*
鬼怒川溫泉站(KINUGAWA ONSEN) —>淺草站(ASAKUSA)KINUGAWA THEME PARK PASS by TOBU RAIL KINU 118 JPY2,160 pp

Day5-7
Local Sightseeing along JR Yamanote Line

Q1, JR Pass?

Q2, I notice JR East has Spacia-Kinugawa鬼怒川號; From SHINJUKU <-> KINUGAWA ONSEN with addon$ to TOBU Rail (how much?) but arrive late around 12 noon. Taking TOBU RAIL KINU, I can arrive by 8:37am/9:57am

Q3, My friend need to do an Airport transfer from HND Haneda to NRT Narita with 3 luggages. What is your transfer recommendation by JR Rail/ Rail/ Bus?

Thanks a lot in advance for the helpful advise.