Roman concession — contained for the whole Church, not expressly; Stapleton modes
Roman doctors do not deny that Scripture contains the whole necessary doctrine of faith or morals — not simply for each person, but somehow for the whole Church. They only deny that it is contained expressly (Bellarmine, De Verbo Dei 4.3 section 2).
Stapleton (Controv. 5 q.5 art.1) offers modes by which the whole saving doctrine is in Scripture: first, Scripture points to the true Church and through that Church teaches all that is needed; second, from dogmas openly set in Scripture the rest can be firmly drawn — as two natures in Christ from the Son's incarnation. Even in that sense, he says, the Fathers teach that all faith needs is comprehended in Scripture.
Latin
VI. Porro etiam totam doctrinam, sive de fide, sive de moribus, necessariam, non quidem singulis simpliciter, sed toti Ecclesiae aliqua ratione Scriptura contineri non negant Doctores Ecclesiae Romanae: sed solum non expresse contineri affirmant, ut videre est apud Bellarminum 4. de Verbo Dei cap. 3. §. 2. Et similiter Stapletonus agens de principiis fidei doctrinalibus, Controv. 5. quaest. 5. art. 1. dum hanc quaestionem explicat, varios modos proponit quibus tota doctrina salutis in Scripturis contineatur. Et primo quidem hunc, quod Scriptura sacra veram Ecclesiam indicans, & ad eam nos mittens, per eam nos omnia necessaria docet. Deinde etiam istum, quod ex multis illis dogmatibus quae in Scripturis aperte posita sunt, reliqua possunt firmiter deduci, sicut dogma de duabus in Jesu Christo naturis ex Filii Dei incarnatione. Nam, inquit, etiam hoc sensu omnia ad fidem necessaria Scripturis comprehendi verum est & Patres docent.