First jhana and vipassana

In various suttas like SN 35.204 and AN 4.170 , we find that both tranquility (*samatha*) and insight (*vipassana*) must be developed in most cases, in order to make progress on the path towards complete liberation. > The swift pair of messengers stands for tranquility (*samatha*) and insight (*vipassana*) > SN 35.204 To me, it appears that *jhana* is needed to overcome the five hindrances ("quite secluded from sensual pleasures, secluded from unskillful qualities, they enter and remain in the first absorption" - DN 10 ), without which, insight is not easily achievable. On the other hand, the *vipassana* contemplations of the Satipatthana Sutta (MN 10) appear to be using *vitakka* and *vicara*. Is this right? We also read: > Sound is a thorn to the first absorption. Placing the mind and keeping > it connected are a thorn to the second absorption. Rapture is a thorn > to the third absorption. Breathing is a thorn to the fourth > absorption. > AN 10.72 So, it sounds to me like, just the first *jhana* is sufficient for *vipassana*, since *vitakka* and *vicara* are thorns to the second *jhana*. So, putting these together, the *vipassana* contemplations of MN 10 is best practised after entering and remaining in the first *jhana*. Is this right?